# List of shipwrecks in April 1918

The list of shipwrecks in April 1918 includes ships sunk, foundered, grounded, or otherwise lost during April 1918.

## 1 April

List of shipwrecks: 1 April 1918 :
| Ship | State | Description |
| Ardglass | United Kingdom | World War I: The cargo ship was torpedoed and sunk in the Irish Sea 7 nautical miles (13 km) north east of Larne, County Antrim by SM UC-31 ( Imperial German Navy) with the loss of seven of her crew. |
| HMS Falcon | Royal Navy | The C-class destroyer collided with the trawler John Fitzgerald ( United Kingdom) and sank in the North Sea off Bridlington, Yorkshire (54°07′45″N 0°22′10″E﻿ / ﻿54.12917°N 0.36944°E﻿ / 54.12917; 0.36944). |
| Lusitano | Portugal | World War I: The barquentine was scuttled in the Atlantic Ocean off the Azores (38°50′N 18°24′W﻿ / ﻿38.833°N 18.400°W﻿ / 38.833; -18.400) by SM U-155 ( Imperial German Navy). Her crew took to the lifeboats but were not rescued. |
| SMS Saturn | Imperial German Navy | The Vorpostenboot was lost on this date. |

## 2 April

List of shipwrecks: 2 April 1918 :
| Ship | State | Description |
| Ashmore | Norway | During a voyage from São Vicente, Cape Verde, to Saint John, New Brunswick, Canada, the 219-foot (67 m), 1,043-gross register ton three-masted barque was wrecked in the Bay of Fundy on the Dixon Rocks off Grand Manan between Long Ledge and Yellow Ledge. |
| Meaford | United Kingdom | World War I: The cargo ship was sunk in the Atlantic Ocean by SM U-53 ( Imperial German Navy) with the loss of all hands. |
| SMS Senator Sthamer | Imperial German Navy | The Vorpostenboot was lost on this date. |
| Solway Queen | United Kingdom | World War I: The coaster was torpedoed and sunk in the Irish Sea 7 nautical miles (13 km) off Black Head, Wigtownshire by SM U-101 ( Imperial German Navy) with the loss of eleven crew. |

## 3 April

List of shipwrecks: 3 April 1918 :
| Ship | State | Description |
| AG-11 | Imperial Russian Navy | World War I: The AG-class submarine was scuttled in the harbour at Hanko. |
| AG-12 | Imperial Russian Navy | World War I: The AG-class submarine was scuttled in the harbour at Hanko. |
| AG-16 | Imperial Russian Navy | World War I: The AG-class submarine was scuttled in the harbour at Hanko. |
| HMS E1 | Royal Navy | World War I: The E-class submarine was scuttled in the Gulf of Finland off the Harmaja Lighthouse. |
| HMS E9 | Royal Navy | World War I: The E-class submarine was scuttled in the Gulf of Finland off the Harmaja Lighthouse. |
| Elina | United States | While the 8-gross register ton motor vessel – with no crew or cargo aboard – was under tow along with two scows by the launch Chomley ( United States), her bow stem pulled out and she broke free off the coast of Southeast Alaska 2 nautical miles (3.7 km; 2.3 mi) southwest of South Vallenar Point (55°25′35″N 131°51′00″W﻿ / ﻿55.42639°N 131.85000°W﻿ / 55.42639; -131.85000﻿ (South Vallenar Point)). By the time Chomley dropped off the scows and returned to Elina, Chomley was able to salvage Elina's gasoline engine, but otherwise Elina had become a total loss. |
| Elsie Burdett | United Kingdom | World War I: The schooner was sunk in the Atlantic Ocean off the Canary Islands, Spain (44°38′N 24°28′W﻿ / ﻿44.633°N 24.467°W﻿ / 44.633; -24.467) by SM U-152 ( Imperial German Navy). Her six crew took to the lifeboat but were not rescued. |
| Sylvie | France | World War I: The cargo ship was sunk in the Mediterranean Sea 120 nautical miles (220 km) north east of Malta by SM UC-54 ( Imperial German Navy). |
| Unknown | United States | The scow sank at the Thames Shipyard, New London, Connecticut. |

## 4 April

List of shipwrecks: 4 April 1918 :
| Ship | State | Description |
| Agatina | Italy | World War I: the barquentine was shelled and sunk in the Mediterranean Sea off Sicily by SM UC-25 ( Imperial German Navy). |
| HMS Bittern | Royal Navy | The Avon-class destroyer collided with Kenilworth ( United Kingdom) in the English Channel off the Isle of Portland, Dorset and sank with the loss of all 63 crew. |
| HMS C26 | Royal Navy | World War I: The C-class submarine was scuttled in the Gulf of Finland off the Harmaja Lighthouse to prevent her capture by German forces. |
| HMS E8 | Royal Navy | World War I: The E-class submarine was scuttled in the Gulf of Finland off the Harmaja Lighthouse prevent her capture by German forces. |
| HMT J&A | Royal Navy | The naval trawler was lost on this date. |
| Liberia | France | World War I: The cargo ship was sunk in the Gulf of Genoa 62 nautical miles (115 km) south east of the Îles d'Hyères (42°04′N 7°02′E﻿ / ﻿42.067°N 7.033°E﻿ / 42.067; 7.033) by SM UC-35 ( Imperial German Navy). Her crew survived. |
| Orange | United States Army | The US Army Corps of Engineers pipeline dredge was destroyed by fire in a canal near the Sabine River. |
| Sincerita | Italy | World War I: The cargo ship was sunk in the Mediterranean Sea (36°17′N 14°48′E﻿ / ﻿36.283°N 14.800°E﻿ / 36.283; 14.800) by SM UB-52 ( Imperial German Navy). Her crew survived. |
| Five unnamed vessels | Royal Navy | World War I: The submarines were scuttled in the Gulf of Finland to prevent their capture by German forces. |

## 5 April

List of shipwrecks: 5 April 1918 :
| Ship | State | Description |
| HMS C27 | Royal Navy | World War I: The C-class submarine was scuttled in the Gulf of Finland off the Harmaja Lighthouse prevent her capture by German forces. |
| HMS C35 | Royal Navy | World War I: The C-class submarine was scuttled in the Gulf of Finland off the Harmaja Lighthouse prevent her capture by German forces. |
| Camelia | Italy | World War I: The barque was shelled and sunk in the Mediterranean Sea off Cap Caccia (40°38′N 8°06′E﻿ / ﻿40.633°N 8.100°E﻿ / 40.633; 8.100) by SM UC-35 ( Imperial German Navy). |
| Cyrene | United Kingdom | World War I: The cargo ship was torpedoed and sunk in Caernarfon Bay 15 nautical miles (28 km) north of Bardsey Island, Caernarfonshire by SM UC-31 ( Imperial German Navy) with the loss of 24 of her crew. |

## 6 April

List of shipwrecks: 6 April 1918 :
| Ship | State | Description |
| Madeleine III | French Navy | World War I: The Q-ship was torpedoed and sunk in the Mediterranean Sea off the coast of Algeria (37°27′N 9°53′E﻿ / ﻿37.450°N 9.883°E﻿ / 37.450; 9.883) by SM UB-50 ( Imperial German Navy) with the loss of seventeen of her twenty crew. The survivors were taken as prisoners of war. |
| Madonna delle Grazie B. | Italy | World War I: The sailing vessel was sunk in the Ionian Sea by SM UC-52 ( Imperial German Navy). |
| Ministre de Smet de Naeyer | Belgium | World War I: The cargo ship struck a mine and sank in the North Sea 45 nautical miles (83 km) north of the Dogger Bank Lightship ( United Kingdom) with the loss of twelve of her 29 crew. |
| HMML 421 | Royal Navy | The motor launch was lost on this date. |
| Sterne | Netherlands | World War I: The sailing vessel was stopped in the North Sea 60 nautical miles (110 km) off Jæren, Rogaland, Norway by SM U-19 ( Imperial German Navy). U-19 intended to sink her but lost sight of her. Sterne came ashore at Utsire, Rogaland and was a total loss. |

## 7 April

List of shipwrecks: 7 April 1918 :
| Ship | State | Description |
| Boscastle | United Kingdom | World War I: The collier was torpedoed and sunk in St. George's Channel 14 nautical miles (26 km) north north west of Strumble Head, Pembrokeshire by SM U-111 ( Imperial German Navy) with the loss of eighteen crew. |
| Catriena | Netherlands | World War I: The sailing vessel was sunk in the North Sea 58 nautical miles (107 km) south west of Egersund, Rogaland, Norway (58°04′N 4°14′E﻿ / ﻿58.067°N 4.233°E﻿ / 58.067; 4.233) by SM UB-73 ( Imperial German Navy). Her crew survived. |
| Highland Brigade | United Kingdom | World War I: The cargo liner was sunk in the English Channel 6 nautical miles (11 km) south by east of St. Catherine's Point (50°35′N 1°14′W﻿ / ﻿50.583°N 1.233°W﻿ / 50.583; -1.233) by SM UC-71 ( Imperial German Navy). Her crew survived. |
| Port Campbell | United Kingdom | World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 115 nautical miles (213 km) west south west of the Bishop Rock, Isles of Scilly by SM U-53 ( Imperial German Navy). Her crew survived. |
| Rye | United Kingdom | World War I: The coaster was torpedoed and sunk in the English Channel 19 nautical miles (35 km) north west by west of Cap d'Antifer, Seine-Inférieure, France (49°57′N 0°07′W﻿ / ﻿49.950°N 0.117°W﻿ / 49.950; -0.117) by SM UB-74 ( Imperial German Navy) with the loss of four of her crew. |
| Sterope | Regia Marina | World War I: The tanker was shelled and sunk in the Atlantic Ocean off the Azores, Portugal (38°44′N 18°09′W﻿ / ﻿38.733°N 18.150°W﻿ / 38.733; -18.150) by SM U-155 ( Imperial German Navy). |
| Vera Cruz | United States | The sailing ship was wrecked at Tampico, Tamaulipas, Mexico. |

## 8 April

List of shipwrecks: 8 April 1918 :
| Ship | State | Description |
| Bengali | United Kingdom | World War I: The cargo ship was torpedoed and sunk in the Mediterranean Sea 14 nautical miles (26 km) off Alexandria, Egypt (31°21′N 29°47′E﻿ / ﻿31.350°N 29.783°E﻿ / 31.350; 29.783) by SM UC-34 ( Imperial German Navy). Her crew survived. |
| HMS E19 | Royal Navy | World War I: The E-class submarine was scuttled in the Gulf of Finland off the Harmaja Lighthouse. |
| Flanders | Belgium | World War I: The cargo ship struck a mine and sank in the North Sea off the coast of the Netherlands. Her crew were rescued. |
| Nyassaland | Norway | World War I: The coaster was sunk in the English Channel 18 nautical miles (33 km) east of Start Point, Devon, United Kingdom by SM UB-33 ( Imperial German Navy). Her crew survived. |
| Superb | Norway | World War I: The sailing vessel was sunk in the North Sea 40 nautical miles (74 km) south of Lindesnes, Vest-Agder by SM U-90 ( Imperial German Navy). Her crew survived. |
| Tainui | United Kingdom | World War I: The cargo ship was torpedoed damaged in the Atlantic Ocean 60 nautical miles (110 km) south west of the Isles of Scilly by SM U-82 ( Imperial German Navy) and was abandoned by her crew. She was beached at Falmouth, Cornwall but was later salvaged, repaired and returned to service. |

## 9 April

List of shipwrecks: 9 April 1918 :
| Ship | State | Description |
| HMT Annie Smith | Royal Navy | The naval trawler was lost on this date. |
| Aveiro | Portugal | World War I: The cargo ship was sunk in the Mediterranean Sea (36°24′N 18°06′E﻿ / ﻿36.400°N 18.100°E﻿ / 36.400; 18.100) by SM UB-53 ( Imperial German Navy). Her crew survived. |
| HMT Lord Hardinge | Royal Navy | The naval trawler collided with another vessel and sank in the Irish Sea off the Daunt Lightship ( United Kingdom). |
| President Leroy-Iallier | France | World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 15 nautical miles (28 km) north west of Ouessant, Finistère (48°50′N 5°13′W﻿ / ﻿48.833°N 5.217°W﻿ / 48.833; -5.217) by SM UB-109 ( Imperial German Navy) with the loss of 26 of her crew. |
| RLS President Daniel E. Howard | Liberia Navy | World War I: The 73 ton Gunboat, an auxiliary sailing vessel and Liberia's only Navy ship, was sunk in the Atlantic Ocean off Monrovia by SM U-154 ( Imperial German Navy). Either crew was captured and paroled, and/or 26 crew were killed. |
| Vasconia | Norway | World War I: The cargo ship struck a mine and sank in the Mediterranean Sea north of Alexandria, Egypt, with the loss of seven of her crew. |

## 10 April

List of shipwrecks: 10 April 1918 :
| Ship | State | Description |
| Asia | United Kingdom | The coaster foundered. Her crew were rescued by a Norwegian merchant vessel. |
| Barge No. 21 | United States | The barge was destroyed by fire in the New Orleans, Louisiana, area. |
| Benedetto Cairoli | Regia Marina | The La Masa-class destroyer collided with Giacinto Carini ( Regia Marina) and sank in the Ionian Sea. |
| Faulx | French Navy | The Bouclier-class destroyer was rammed and sunk in the Strait of Otranto by Mangini ( French Navy). |
| Henley | United Kingdom | World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 25 nautical miles (46 km) south west of The Lizard, Cornwall (49°35′N 5°31′W﻿ / ﻿49.583°N 5.517°W﻿ / 49.583; -5.517) by SM UB-109 ( Imperial German Navy) with the loss of six of her crew. |
| USS SC-126 | United States Navy | The submarine chaser grounded and partially sank near Two Rocks Passage, Bermuda Harbor; finally sank about 100 yards (91 m) south of Agar's Island. Raised, repaired, and returned to service in October. |
| San Sabra | United States | World War I: The passenger ship was sunk by a mine with all 30 hands 15 miles (24 km) south east of Barnegat Lighthouse, New Jersey. |
| Westfield | United Kingdom | World War I: The cargo ship was sunk in the Atlantic Ocean 45 nautical miles (83 km) south west by south of the Bishop Rock, Isles of Scilly (49°10′N 6°46′W﻿ / ﻿49.167°N 6.767°W﻿ / 49.167; -6.767) by SM U-82 ( Imperial German Navy). Her crew survived. |

## 11 April

List of shipwrecks: 11 April 1918 :
| Ship | State | Description |
| Carmela G | Italy | World War I: The sailing vessel was sunk in the Mediterranean Sea west of Sicily by SM UB-50 ( Imperial German Navy). |
| Highland Prince | United Kingdom | World War I: The cargo ship was torpedoed and sunk in the Mediterranean Sea 36 nautical miles (67 km) north east of Cape Bon, Algeria (37°27′N 11°32′E﻿ / ﻿37.450°N 11.533°E﻿ / 37.450; 11.533) by SM UB-50 ( Imperial German Navy) with the loss of three of her crew. |
| HMS King Alfred | Royal Navy | World War I: The Drake-class cruiser was torpedoed and damaged in the Atlantic Ocean 30 nautical miles (56 km) north of Malin Head, County Donegal by SM UB-86 ( Imperial German Navy) with the loss of a crew member. |
| Kingstonian | United Kingdom | World War I: The cargo ship was torpedoed and damaged in the Mediterranean Sea off San Pietro Island, Italy (39°20′N 7°10′E﻿ / ﻿39.333°N 7.167°E﻿ / 39.333; 7.167) by SM UB-68 ( Imperial German Navy) with the loss of a crew member. She was beached in Carloforte Bay but was again torpedoed and damaged on 29 April by SM UB-48 ( Imperial German Navy) and was a total loss. |
| USS Lakemoor | United States Navy | World War I: The cargo ship was torpedoed and sunk in the Irish Sea 2.5 nautical miles (4.6 km) off the Corsewall Lighthouse, Wigtownshire, United Kingdom by SM UB-64 ( Imperial German Navy) with the loss of 46 of her crew. |
| USS Mary B. Garner | United States Navy | The patrol vessel ran aground at Prime Hook, Delaware and was wrecked. She was later salvaged, repaired and returned to service. One killed. |
| Myrtle Branch | United Kingdom | World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 9 nautical miles (17 km) north east by north of Inishtrahull Island, County Donegal by SM UB-73 ( Imperial German Navy) with the loss of fifteen of her crew. |
| SMS Rheinland | Imperial German Navy | The Nassau-class battleship ran aground on Laagskar Island, Åland, Sweden with the loss of two of her crew. She was refloated on 20 April and subsequently served as a barracks ship. |
| SM UB-33 | Imperial German Navy | World War I: The Type UB II submarine struck a mine and sank in the Strait of Dover (50°55′N 1°17′E﻿ / ﻿50.917°N 1.283°E﻿ / 50.917; 1.283) with the loss of all 28 crew. |

## 12 April

List of shipwrecks: 12 April 1918 :
| Ship | State | Description |
| Autolycus | United Kingdom | World War I: The cargo ship was torpedoed and sunk in the Mediterranean Sea 38 nautical miles (70 km) off Cape Palos, Spain (38°01′N 0°23′E﻿ / ﻿38.017°N 0.383°E﻿ / 38.017; 0.383) by SM U-34 ( Imperial German Navy). Her crew survived. |
| HM CMB-18A | Royal Navy | The Coastal Motor Boat was lost on this date. |
| HM CMB-33A | Royal Navy | The Coastal Motor Boat was lost on this date. |
| Lonhelen | United Kingdom | World War I: The cargo ship struck a mine and sank in the North Sea south west of the Shipwash Lightship ( United Kingdom). Her crew survived. |
| Luis | United Kingdom | World War I: The cargo ship was torpedoed and sunk in the English Channel 3.5 nautical miles (6.5 km) south south east of St. Catherine's Point, Isle of Wight by SM UC-71 ( Imperial German Navy) with the loss of four of her crew. |
| Luisa | Spain | World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 6 nautical miles (11 km) west by south of the Pendeen Lighthouse, Cornwall, United Kingdom (50°07′N 5°49′W﻿ / ﻿50.117°N 5.817°W﻿ / 50.117; -5.817) by SM UB-74 ( Imperial German Navy). Her crew survived. |
| Moyune | United Kingdom | World War I: Convoy HE 9: The cargo ship was torpedoed and sunk in the Mediterranean sea off Cape Palos (37°26′N 0°06′E﻿ / ﻿37.433°N 0.100°E﻿ / 37.433; 0.100) by SM U-34 ( Imperial German Navy). Her crew survived. |
| Njaal | Russia | World War I: The barque was sunk in the North Sea off Flekkefjord by SM U-104 ( Imperial German Navy). |

## 13 April

List of shipwrecks: 13 April 1918 :
| Ship | State | Description |
| City of Wilmington | United States | The steamer burned and sank in the Atlantic Ocean 250 miles (400 km) east of Halifax, Nova Scotia. |
| Harewood | United Kingdom | World War I: The cargo ship was shelled and sunk in the Atlantic Ocean 380 nautical miles (700 km) west by south of Lisbon, Portugal by SM U-155 ( Imperial German Navy) with the loss of two of her crew. |
| Provence | France | World War I: The cargo ship was torpedoed and damaged in the Mediterranean Sea 1.5 nautical miles (2.8 km) off the Cape Palamos Lighthouse, Spain (41°43′N 3°09′E﻿ / ﻿41.717°N 3.150°E﻿ / 41.717; 3.150) by SM UB-68 ( Imperial German Navy). She was beached but was later refloated, repaired and returned to service. |
| Ruth | United Kingdom | World War I: The fishing smack was scuttled in the North Sea by a Kaiserliche Marine submarine. |
| Wilson | United Kingdom | World War I: The schooner was scuttled in the Atlantic Ocean 10 nautical miles (19 km) north west of the Smalls Lighthouse by SM UB-109 ( Imperial German Navy). Her crew survived. |

## 14 April

List of shipwrecks: 14 April 1918 :
| Ship | State | Description |
| Admiral Codrington | United Kingdom | and Southgare ( Sweden): The two cargo ships collided in the North Sea off the coast of the East Riding of Yorkshire. Southgare sank about 6 nautical miles (11 km) off Crab Rocks, Bempton Cliffs, with the loss of 11 men; 10 were rescued. The newly built Admiral Codrington sank just south of Flamborough Head. |
| Chelford | United Kingdom | World War I: The cargo ship was torpedoed and sunk in the Irish Sea north west of Bardsey Island, Pembrokeshire (52°48′N 5°04′W﻿ / ﻿52.800°N 5.067°W﻿ / 52.800; -5.067) by SM UB-73 ( Imperial German Navy). Her crew survived. |
| Maroc | France | World War I: The cargo ship was sunk in the Atlantic Ocean 2 nautical miles (3.7 km) off the Longships Lighthouse, Cornwall, United Kingdom by SM UB-74 ( Imperial German Navy). |
| Marstonmoor | United Kingdom | World War I: The collier was torpedoed and sunk in the Atlantic Ocean 55 nautical miles (102 km) north north east of Cape Wrath, Sutherland (59°34′N 4°45′W﻿ / ﻿59.567°N 4.750°W﻿ / 59.567; -4.750) by SM U-107 ( Imperial German Navy). Her crew survived. |
| SS Santa Isabel | United Kingdom | World War I: The cargo ship was shelled and sunk in the Atlantic Ocean 15 nautical miles (28 km) off the Cape Verde Islands, Portugal by SM U-153 ( Imperial German Navy) with the loss of a crew member. |

## 15 April

List of shipwrecks: 15 April 1918 :
| Ship | State | Description |
| Ailsa Craig | United Kingdom | World War I: The cargo ship was sunk in the English Channel 14 nautical miles (26 km) west by north of Portland Bill, Dorset (50°30′N 2°48′W﻿ / ﻿50.500°N 2.800°W﻿ / 50.500; -2.800) by SM UB-80 ( Imperial German Navy). Her crew survived. |
| Pomeranian | United Kingdom | World War I: The ship was sunk in the English Channel 9 nautical miles (17 km) off Portland Bill by SM UC-77 ( Imperial German Navy) with the loss of 55 lives. |
| Rostov | Imperial Russian Navy | World War I: The transport ship was sunk in the Black Sea south of Sevastopol (44°34′N 34°20′E﻿ / ﻿44.567°N 34.333°E﻿ / 44.567; 34.333) by SM UC-23 ( Imperial German Navy). |

## 16 April

List of shipwrecks: 16 April 1918 :
| Ship | State | Description |
| Florence H. | United States | The cargo ship suffered an onboard explosion and sank at anchor in Quiberon Bay, or in the port of Quiberon with the loss of 17 gunners and 24 of her 75 crew, 32 survivors, including 6 gunners, were rescued by a destroyer. |
| H5 | Italian Royal Navy | World War I: The H-class submarine was sunk in error in the southern Adriatic Sea by a torpedo fired by the submarine HMS H1 ( Royal Navy). |
| Hungerford | United Kingdom | World War I: The cargo ship was torpedoed and sunk in the English Channel 9 nautical miles (17 km) south south east of the Owers Lightship (50°33′N 0°35′W﻿ / ﻿50.550°N 0.583°W﻿ / 50.550; -0.583) by SM UC-75 ( Imperial German Navy) with the loss of eight of her crew. |
| Ladoga | United Kingdom | World War I: The cargo ship was torpedoed and sunk in the Irish Sea 15 nautical miles (28 km) south east of the South Arklow Lightship ( United Kingdom) (52°33′N 5°35′W﻿ / ﻿52.550°N 5.583°W﻿ / 52.550; -5.583) by SM UB-73 ( Imperial German Navy) with the loss of 29 of her crew. |
| Lake Michigan | United Kingdom | World War I: The passenger ship was torpedoed and sunk in the Atlantic Ocean 93 nautical miles (172 km) north by west of Eagle Island, County Mayo (55°30′N 11°52′W﻿ / ﻿55.500°N 11.867°W﻿ / 55.500; -11.867) by SM U-100 ( Imperial German Navy with the loss of a crew member. |
| Lodaner | United Kingdom | World War I: The cargo ship was sunk in the Irish Sea south east of the South Arklow Lightship ( United Kingdom) by SM UB-73 ( Imperial German Navy) with the loss of all 32 crew. |
| Nirpura | United Kingdom | World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 110 nautical miles (200 km) west north west of Cabo da Roca, Portugal (38°57′N 11°55′W﻿ / ﻿38.950°N 11.917°W﻿ / 38.950; -11.917) by SM U-155 ( Imperial German Navy). Her crew survived. |
| Polarine | United States | The motor boat sank off Watch Hill, Rhode Island. |
| Romania | Italy | World War I: The cargo ship was sunk in the Adriatic Sea off Cape Linguetta, Albania (40°24′N 19°14′E﻿ / ﻿40.400°N 19.233°E﻿ / 40.400; 19.233) by SM UC-22 ( Imperial German Navy). Her crew survived. |
| HMT Select | Royal Navy | The naval trawler was lost on this date. |
| SMS Streiter | Austro-Hungarian Navy | World War I: The Huszár-class destroyer collided with Petka ( Austria-Hungary) and sank in the Adriatic Sea off Lovran (45°00′N 14°15′E﻿ / ﻿45.000°N 14.250°E﻿ / 45.000; 14.250). She was escorting a convoy at the time. |
| Widwud | Russia | World War I: The sailing vessel was sunk in the Atlantic Ocean north west of Ireland by SM U-104 ( Imperial German Navy). |

## 17 April

List of shipwrecks: 17 April 1918 :
| Ship | State | Description |
| SMS LM2 | Imperial German Navy | World War I: The L1-class motor patrol boat was destroyed by a fire or explosion. |
| SM UB-82 | Imperial German Navy | World War I: The Type UB III submarine was depth charged and sunk in the Irish Sea (55°13′N 5°55′W﻿ / ﻿55.217°N 5.917°W﻿ / 55.217; -5.917) by two Royal Navy trawlers with the loss of all 32 crew. |

## 18 April

List of shipwrecks: 18 April 1918 :
| Ship | State | Description |
| Bamse | United Kingdom | World War I: The coaster was torpedoed and sunk in the English Channel 15 nautical miles (28 km) west by north of Portland Bill, Dorset by SM UB-80 ( Imperial German Navy) with the loss of four of her crew. |
| Claus Groth | Imperial German Navy | World War I: The Greta-class Vorpostenboot was sunk by mines off Cape Tachkuna, Estonia. |
| Dalegarth Force | United Kingdom | World War I: The cargo ship was torpedoed and sunk in the English Channel 12 nautical miles (22 km) south west of Hartland Point, Devon (50°51′N 4°42′W﻿ / ﻿50.850°N 4.700°W﻿ / 50.850; -4.700) by SM UB-73 ( Imperial German Navy) with the loss of five crew. |
| Gregynog | United Kingdom | World War I: The collier was torpedoed and sunk in the English Channel 16 nautical miles (30 km) south west of Hartland Point (50°47′N 4°44′W﻿ / ﻿50.783°N 4.733°W﻿ / 50.783; -4.733) by SM UB-86 ( Imperial German Navy) with the loss of three of her crew. |
| Pentyrch | United Kingdom | World War I: The cargo ship was torpedoed and sunk in the English Channel 5 nautical miles (9.3 km) west north west of the Brighton Lightship ( United Kingdom) by SM UB-40 ( Imperial German Navy) with the loss of a crew member. |
| Runswick | United Kingdom | World War I: The cargo ship was torpedoed and damaged in the Atlantic Ocean 3 nautical miles (5.6 km) north of Trevose Head, Cornwall (50°33′N 5°03′W﻿ / ﻿50.550°N 5.050°W﻿ / 50.550; -5.050) by SM UB-109 ( Imperial German Navy). She was beached but was declared a total loss. Her crew survived. |

## 19 April

List of shipwrecks: 19 April 1918 :
| Ship | State | Description |
| Alice Taylor | United Kingdom | The coaster foundered on this date. Her crew were rescued. |
| Elka | Greece | World War I: Convoy GaG16: The cargo ship was torpedoed and sunk in the Mediterranean Sea 50 nautical miles (93 km) off Cape Gati, Spain, by SM U-34 ( Imperial German Navy). Her crew survived. |
| Lord Charlemont | United Kingdom | World War I: The cargo ship was torpedoed and sunk in the Mediterranean Sea 22 nautical miles (41 km) north of the Isla de Alborán, Morocco (36°15′N 3°04′W﻿ / ﻿36.250°N 3.067°W﻿ / 36.250; -3.067) by SM U-34 ( Imperial German Navy) with the loss of eight crew. |
| Salambo | French Navy | World War I: The naval trawler was torpedoed and sunk in the Ionian Sea (38°30′N 18°06′E﻿ / ﻿38.500°N 18.100°E﻿ / 38.500; 18.100) by SM U-38 ( Imperial German Navy). Her crew survived. |
| SM UB-78 | Imperial German Navy | World War I: The Type UB III submarine struck a mine and sank in the Strait of Dover (51°01′N 1°17′E﻿ / ﻿51.017°N 1.283°E﻿ / 51.017; 1.283) with the loss of all 35 crew. |
| War Helmet | United Kingdom | World War I: The cargo ship was torpedoed and sunk in the English Channel 3 nautical miles (5.6 km) east by north of the Owers Lightship ( United Kingdom) by SM UC-75 ( Imperial German Navy). Her crew survived. |

## 20 April

List of shipwrecks: 20 April 1918 :
| Ship | State | Description |
| Florrieston | United Kingdom | World War I: The cargo ship was torpedoed and sunk in the Irish Sea 6 nautical miles (11 km) east of South Stack, Anglesey by SM U-91 ( Imperial German Navy) with the loss of nineteen of her crew. |
| Lowther Range | United Kingdom | World War I: The cargo ship was torpedoed and sunk in the Irish Sea 20 nautical miles (37 km) west by north of South Stack (53°18′N 5°10′W﻿ / ﻿53.300°N 5.167°W﻿ / 53.300; -5.167) by SM U-104 ( Imperial German Navy). Her crew survived. |
| SMS M39 | Imperial German Navy | World War I: The Type 1915 minesweeper struck a mine and sank in the North Sea. |
| SMS M64 | Imperial German Navy | World War I: The Type 1916 minesweeper struck a mine and sank in the North Sea. |
| SMS M95 | Imperial German Navy | World War I: The Type 1916 minesweeper struck a mine and sank in the North Sea. |
| HMT Numitor | Royal Navy | World War I: The naval trawler struck a mine and sank in the North Sea off Orfordness, Suffolk (52°07′N 1°45′E﻿ / ﻿52.117°N 1.750°E﻿ / 52.117; 1.750) with the loss of five of her crew. |

## 21 April

List of shipwrecks: 21 April 1918 :
| Ship | State | Description |
| Bellview | United Kingdom | World War I: The collier was torpedoed and sunk in the Mediterranean Sea 16 nautical miles (30 km) east north east of Cape Bon, Tunisia (37°13′N 11°21′E﻿ / ﻿37.217°N 11.350°E﻿ / 37.217; 11.350) by SM U-32 ( Imperial German Navy). Her crew survived. |
| Delta A | Belgium | World War I: The trawler was stopped and sunk in the Atlantic Ocean 18 nautical miles (33 km) south of St. Kilda, Inverness-shire, United Kingdom by SM U-19 ( Imperial German Navy). |
| SMS Emma Oetken | Imperial German Navy | The Vorpostenboot was lost on this date. |
| Landonia | United Kingdom | World War I: The cargo ship was torpedoed and sunk in the Irish Sea 27 nautical miles (50 km) north west by west of Strumble Head, Pembrokeshire by SM U-91 ( Imperial German Navy) with the loss of 21 of her crew. One of the survivors was taken as a prisoner of war. |
| Normandiet | United Kingdom | World War I: The cargo ship was torpedoed and sunk in the Irish Sea 34 nautical miles (63 km) south west by west of the Calf of Man, Isle of Man by SM U-91 ( Imperial German Navy) with the loss of nineteen of her crew. |
| SM UB-71 | Imperial German Navy | World War I: The Type UB III submarine was depth charged and sunk in the Strait of Gibraltar (35°38′N 5°18′W﻿ / ﻿35.633°N 5.300°W﻿ / 35.633; -5.300) by HMML 413 ( Royal Navy) with the loss of all 32 crew. |
| Westergate | United Kingdom | World War I: The cargo ship was torpedoed and sunk in the English Channel 22 nautical miles (41 km) east of Start Point, Devon by SM UB-80 ( Imperial German Navy) with the loss of 24 of her crew. |

## 22 April

List of shipwrecks: 22 April 1918 :
| Ship | State | Description |
| Baron Herries | Royal Navy | World War I: The naval tug was torpedoed and sunk in the Atlantic Ocean 43 nautical miles (80 km) north by west of the Bishop Rock, Isles of Scilly (50°27′N 7°06′W﻿ / ﻿50.450°N 7.100°W﻿ / 50.450; -7.100) by SM U-91 ( Imperial German Navy) with the loss of three of her crew. One of the survivors was taken as a prisoner of war. |
| Dronning Maud | United Kingdom | World War I: The collier was torpedoed and sunk in the Mediterranean Sea 65 nautical miles (120 km) north north east of Cape Sigli, Algeria (38°00′N 4°56′E﻿ / ﻿38.000°N 4.933°E﻿ / 38.000; 4.933) by SM U-34 ( Imperial German Navy) with the loss of a crew member. |
| Eric Calvert | United Kingdom | World War I: The collier was torpedoed and sunk in the Atlantic Ocean 4 nautical miles (7.4 km) south south west of St Anthony Head, Cornwall 50°04′30″N 5°01′45″W﻿ / ﻿50.07500°N 5.02917°W﻿ / 50.07500; -5.02917) by SM UB-103 ( Imperial German Navy) with the loss of two of her crew. |
| USS Fenimore | United States Navy | The cargo ship was destroyed by fire in New York Harbor. |
| Fern | United Kingdom | World War I: The cargo ship was torpedoed and sunk in the Irish Sea 5 nautical miles (9.3 km) east of the Kish Lightship ( United Kingdom) by SM U-104 ( Imperial German Navy) with the loss of thirteen crew. |
| Kheda Moulekar | France | World War I: The sailing vessel was sunk in the Mediterranean Sea (32°08′N 32°50′E﻿ / ﻿32.133°N 32.833°E﻿ / 32.133; 32.833) by SM UB-53 ( Imperial German Navy). |
| Marshalla | United Kingdom | World War I: The sailing vessel was sunk by shellfire in the Mediterranean Sea 50 nautical miles (93 km) north of Port Said, Egypt (32°11′N 32°39′E﻿ / ﻿32.183°N 32.650°E﻿ / 32.183; 32.650) by SM UB-53 ( Imperial German Navy). |
| Prinz August Wilhelm | Germany | The Hamburg America Line steamship was burned and scuttled in Puerto Colombia to prevent the United States Shipping Board from seizing her. |
| HMT Pursuit | Royal Navy | The naval trawler was lost on this date. |
| Sadika | France | World War I: The sailing vessel was sunk in the Mediterranean Sea (32°13′N 32°40′E﻿ / ﻿32.217°N 32.667°E﻿ / 32.217; 32.667) by SM UB-53 ( Imperial German Navy). |
| SM UB-55 | Imperial German Navy | World War I: The Type UB III submarine struck a mine and sank in the Strait of Dover (51°01′N 1°20′E﻿ / ﻿51.017°N 1.333°E﻿ / 51.017; 1.333) with the loss of 23 of her 29 crew. |
| Welbeck Hall | United Kingdom | World War I: The ship was torpedoed and sunk in the Mediterranean Sea 75 nautical miles (139 km) north east by north of Port Said by SM UB-53 ( Imperial German Navy) with the loss of four of her crew. |

## 23 April

List of shipwrecks: 23 April 1918 :
| Ship | State | Description |
| HMS Brilliant | Royal Navy | World War I: First Ostend Raid: The Apollo-class cruiser was scuttled as a blockship at Ostend, West Flanders, Belgium. |
| HMS C3 | Royal Navy | World War I: Zeebrugge Raid: Packed with explosives, the C-class submarine was rammed into the a viaduct connecting the mole to the shore at Zeebrugge, West Flanders, Belgium, and detonated in order to destroy the viaduct. |
| Frances | United Kingdom | World War I: The ketch was scuttled in the Atlantic Ocean (46°33′N 12°05′W﻿ / ﻿46.550°N 12.083°W﻿ / 46.550; -12.083) by SM U-155 ( Imperial German Navy) with the loss of two of her crew. |
| HMS Intrepid | Royal Navy | World War I: Zeebrugge Raid: The destroyer was scuttled at Zeebrugge in an attempt to block the entrance to the Bruges Canal. |
| HMS Iphigenia | Royal Navy | World War I: Zeebrugge Raid: The destroyer was scuttled at Zeebrugge in an attempt to block the entrance to the Bruges Canal. |
| Laurium | United Kingdom | World War I: The coaster struck a mine and sank in the North Sea off the Inner Dowsing Lightship ( United Kingdom) with the loss of a crew member. |
| HMML 110 | Royal Navy | The motor launch was lost on this date. |
| HMML 424 | Royal Navy | The motor launch was lost on this date. |
| HMS North Star | Royal Navy | World War I: Zeebrugge Raid: The Admiralty M-class destroyer was shelled and sunk at Zeebrugge by German shore-based artillery. |
| Peregrine | United Kingdom | World War I: The trawler was shelled and sunk in Yell Sound by SM U-19 ( Imperial German Navy). Her crew survived. |
| HMT Plethos | Royal Navy | World War I: The naval trawler struck a mine and sank in the North Sea 40 nautical miles (74 km) east north east of Montrose, Forfarshire with the loss of four of her crew. |
| Restaurado | Portugal | World War I: The sailing vessel was sunk in the Atlantic Ocean off the coast of Portugal by SM UB-105 ( Imperial German Navy). |
| HMS Sirius | Royal Navy | World War I: First Ostend Raid: The Apollo-class cruiser was scuttled as a blockship at Ostend. |
| HMS Thetis | Royal Navy | World War I: Zeebrugge Raid: The Apollo-class cruiser was scuttled at Zeebrugge in an attempt to block the entrance to the Bruges Canal. |
| Tyne Wave | United Kingdom | World War I: The trawler was shelled and sunk in the North Sea 16 nautical miles (30 km) north east of Ronas Voe, Shetland Islands by SM U-19 ( Imperial German Navy). Her crew survived. |

## 24 April

List of shipwrecks: 24 April 1918 :
| Ship | State | Description |
| Agnete | United Kingdom | World War I: The cargo ship was torpedoed and sunk in the English Channel 4 nautical miles (7.4 km) south by west of Start Point, Devon by a Kaiserliche Marine submarine with the loss of twelve of her crew. |
| Leonor | Portugal | World War I: The trawler was scuttled in the Atlantic Ocean off the coast of Portugal by SM UB-105 ( Imperial German Navy). |
| Mabrouska | France | World War I: The sailing vessel was sunk in the Mediterranean Sea (32°44′N 32°40′E﻿ / ﻿32.733°N 32.667°E﻿ / 32.733; 32.667) by SM UB-53 ( Imperial German Navy). |

## 25 April

List of shipwrecks: 25 April 1918 :
| Ship | State | Description |
| HMS Cowslip | Royal Navy | World War I: The Anchusa-class sloop was sunk in the Atlantic Ocean off Cape Spartel, Morocco by SM UB-105 ( Imperial German Navy) with the loss of six of her 93 crew. |
| Joseph | France | World War I: The sailing vessel was sunk in the English Channel off Cherbourg, Seine-Inférieure by SM UB-31 ( Imperial German Navy). |
| Sevilla | Norway | World War I: The cargo ship was sunk in the English Channel 3 nautical miles (5.6 km) north west of Berry Head, Devon, United Kingdom (50°24′N 3°23′W﻿ / ﻿50.400°N 3.383°W﻿ / 50.400; -3.383) by SM UB-80 ( Imperial German Navy) with the loss of a crew member. |
| Sote | Sweden | World War I: The cargo ship was torpedoed and sunk in the North Sea off Flamborough Head, East Riding of Yorkshire, United Kingdom by SM UC-64 ( Imperial German Navy) with the loss of a crew member. |
| HMS St. Seiriol | Royal Navy | World War I: The auxiliary minesweeper struck a mine and sank in the North Sea off the Shipwash Lightship ( United Kingdom) with the loss of twelve of her crew. |
| SM U-104 | Imperial German Navy | World War I: The Type U 57 submarine was depth charged and sunk in St. George's Channel (51°59′N 6°26′W﻿ / ﻿51.983°N 6.433°W﻿ / 51.983; -6.433) by USS Cushing ( United States Navy) and HMS Jessamine ( Royal Navy) with the loss of 41 of her 42 crew. |
| HMS Willow Branch | Royal Navy | World War I: The Q-ship was sunk in the Atlantic Ocean off Cabo Blanco, Mauritania (21°00′N 17°56′W﻿ / ﻿21.000°N 17.933°W﻿ / 21.000; -17.933) by SM U-153 and SM U-154 (both Imperial German Navy) with the loss of 58 of her crew. |
| HM Torpedo Boat 90 | Royal Navy | The torpedo boat capsized and sank off Gibraltar. |

## 26 April

List of shipwrecks: 26 April 1918 :
| Ship | State | Description |
| Angelina di Paola | Italy | World War I: The brig was sunk in the Mediterranean Sea north of Cape San Vito, Sicily by SM UB-68 ( Imperial German Navy). |
| Ethel | United Kingdom | World War I: The schooner was shelled and sunk in the Irish Sea 19 nautical miles (35 km) north by east of the Smalls Lighthouse by SM U-91 ( Imperial German Navy). Her crew survived. |
| USS G-3 | United States Navy | The G-class submarine ran aground on Eel Grass Shoal near Fishers Island, New York. Refloated and returned to service |
| Leopold d'Or | France | World War I: The cargo ship was torpedoed and sunk in the Tyrrhenian Sea off San Pietro Island, Italy (39°55′N 7°02′E﻿ / ﻿39.917°N 7.033°E﻿ / 39.917; 7.033) by SM UB-48 ( Imperial German Navy). |
| Llyngwair | United Kingdom | World War I: The collier was torpedoed and sunk in the North Sea 5 nautical miles (9.3 km) south south east of Seaham Harbour, County Durham by SM UC-64 ( Imperial German Navy) with the loss of eight of her crew. |
| Westerly | United States | The steamer was sunk in a collision with Lucidina ( United Kingdom) off Brest, France. |

## 27 April

List of shipwrecks: 27 April 1918 :
| Ship | State | Description |
| Azizeh | France | World War I: The sailing vessel was sunk in the Mediterranean Sea (32°07′N 32°32′E﻿ / ﻿32.117°N 32.533°E﻿ / 32.117; 32.533) by SM UB-53 ( Imperial German Navy). |
| Gresham | United Kingdom | World War I: The cargo ship was torpedoed and sunk in the Irish Sea 18 nautical miles (33 km) north west by north of Strumble Head, Pembrokeshire (52°14′N 5°05′W﻿ / ﻿52.233°N 5.083°W﻿ / 52.233; -5.083) by SM U-91 ( Imperial German Navy). Her crew survived. |
| Nemaat Kheda | France | World War I: The sailing vessel was sunk in the Mediterranean Sea (32°07′N 32°32′E﻿ / ﻿32.117°N 32.533°E﻿ / 32.117; 32.533) by SM UB-53 ( Imperial German Navy). Her crew survived. |
| Romany | United Kingdom | World War I: The tanker was torpedoed and sunk in the Mediterranean Sea 47 nautical miles (87 km) west south west of Cape Spartivento, Italy, by SM UB-48 ( Imperial German Navy). Her crew survived. |
| Walpas | Russia | World War I: The sailing vessel was sunk in the Irish Sea 15 nautical miles (28 km) west by north of Bardsey Island, Pembrokeshire by SM U-91 ( Imperial German Navy). |

## 28 April

List of shipwrecks: 28 April 1918 :
| Ship | State | Description |
| HM CMB-39B | Royal Navy | The Coastal Motor Boat was lost on this date. |
| Damao | Portugal | World War I: The cargo ship was sunk in St. George's Channel 12 nautical miles (22 km) west of Bardsey Island, Pembrokeshire, United Kingdom by SM U-91 ( Imperial German Navy). |
| Elba | United Kingdom | World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 6 nautical miles (11 km) north west of the Pendeen Lighthouse (50°13′N 5°48′W﻿ / ﻿50.217°N 5.800°W﻿ / 50.217; -5.800) by SM UB-103 ( Imperial German Navy) with the loss of ten of her crew. |
| HMT Emley | Royal Navy | World War I: The naval trawler was sunk in the Firth of Forth south of the Isle of May, Fife by SM UC-40 ( Imperial German Navy) with the loss of eight of her crew. |
| Kingstonian | United Kingdom | World War I: the cargo ship was torpedoed and sunk in Carloforte Bay by SM UB-48 ( Imperial German Navy) with the loss of a crew member. |
| Moose | United Kingdom | World War I: The tug was torpedoed and sunk in Carloforte Bay by SM UB-48 ( Imperial German Navy). |
| Oronsa | United Kingdom | World War I: The passenger ship was torpedoed and sunk in St. George's Channel 12 nautical miles (22 km) west of Bardsey Island by SM U-91 ( Imperial German Navy) with the loss of three of her crew. |
| Poitiers | France | World War I: The cargo ship was sunk in the Atlantic Ocean 4 nautical miles (7.4 km) south west of Hartland Point, Devon, United Kingdom by SM U-60 ( Imperial German Navy). |
| Rimfakse | Norway | World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 10 nautical miles (19 km) south west of Hartland Point (50°54′N 4°35′W﻿ / ﻿50.900°N 4.583°W﻿ / 50.900; -4.583) by SM U-60 ( Imperial German Navy). Her crew survived. |
| USS Saint Paul | United States Navy | The ocean liner turned on her side and sank at her pier at West Twenty-second Street, New York City, New York while undergoing conversion to a troop transport. Later refloated, but the conversion was halted, and the vessel returned to her owners after the war ended, unrepaired. Two people were killed. |
| Upcerne | United Kingdom | World War I: The cargo ship was torpedoed and sunk in the North Sea 4 nautical miles (7.4 km) south east by east of Coquet Island, Northumberland by SM UC-40 ( Imperial German Navy) with the loss of sixteen of her crew. |
| Verdun | France | World War I: The cargo ship was sunk in the Gulf of Gabès 37 nautical miles (69 km) east of Kerkennah, Tunisia (34°49′N 11°52′E﻿ / ﻿34.817°N 11.867°E﻿ / 34.817; 11.867) by SM UC-20 ( Imperial German Navy). |

## 29 April

List of shipwrecks: 29 April 1918 :
| Ship | State | Description |
| Australier | United Kingdom | World War I: The cargo ship was torpedoed and sunk in the English Channel 6 nautical miles (11 km) south west by south of Dungeness, Kent (50°52′N 0°58′E﻿ / ﻿50.867°N 0.967°E﻿ / 50.867; 0.967) by SM UB-57 ( Imperial German Navy) with the loss of five of her crew. |
| Broderick | United Kingdom | World War I: The cargo ship was torpedoed and sunk in the English Channel 7 nautical miles (13 km) south south east of Hastings, Sussex by SM UB-57 ( Imperial German Navy). Her crew survived. |
| Christiana Davis | United Kingdom | World War I: The schooner was shelled and sunk in the Atlantic Ocean 8 nautical miles (15 km) south east by south of the Tuskar Rock, Ireland by SM U-105 ( Imperial German Navy). Her crew survived. |
| City of Pensacola | United States | World War I: The auxiliary four-masted schooner was sunk in the Mediterranean Sea off Garrucha, Almería, Spain (38°58′N 4°21′E﻿ / ﻿38.967°N 4.350°E﻿ / 38.967; 4.350) by SM UB-105 ( Imperial German Navy). Her crew survived. |
| HMS Dalkeith | Royal Navy | World War I: The naval tug was sunk in the Mediterranean Sea off San Pietro Island, Italy, by SM UB-48 ( Imperial German Navy) with the loss of nine of her crew. |
| Ellis Sayer | United Kingdom | The collier was lost on this date. |
| Frogner | Norway | World War I: The cargo ship was sunk in the English Channel 3 nautical miles (5.6 km) off Portland Bill, Dorset, United Kingdom by SM UC-17 ( Imperial German Navy). Her crew survived. |
| Johnny Toole | United Kingdom | World War I: The ketch was shelled and sunk in the Atlantic Ocean 3 nautical miles (5.6 km) south of the Tuskar Rock by SM U-105 ( Imperial German Navy). Her crew survived. |
| Kut Sang | United Kingdom | World War I: The cargo ship was torpedoed and sunk in the Mediterranean Sea 40 nautical miles (74 km) east south east of Cape Palos, Spain, by SM UB-105 ( Imperial German Navy) with the loss of 59 of her crew. |
| La Somme | France | World War I: The cargo ship was sunk in the English Channel 5 nautical miles (9.3 km) west south west of Dungeness (50°52′N 0°51′E﻿ / ﻿50.867°N 0.850°E﻿ / 50.867; 0.850) by SM UB-57 ( Imperial German Navy) with the loss of a crew member. |
| Maria | Greece | World War I: The vessel was sunk in the Mediterranean Sea (35°38′N 13°20′E﻿ / ﻿35.633°N 13.333°E﻿ / 35.633; 13.333) by SM U-27 ( Austro-Hungarian Navy). Her crew survived. |
| Prarial | French Navy | The Pluviose-class submarine collided with the steamer Tropic ( United Kingdom) in the English Channel off Le Havre, Seine Maritime, France, and sank with the loss of nineteen of her 26 crew. |
| Saint Chamond | France | World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 14 nautical miles (26 km) north of St. Ives Head, Cornwall, United Kingdom (50°15′N 5°30′W﻿ / ﻿50.250°N 5.500°W﻿ / 50.250; -5.500) by SM U-60 ( Imperial German Navy). Her crew survived. |

## 30 April

List of shipwrecks: 30 April 1918 :
| Ship | State | Description |
| Conway | United Kingdom | World War I: The cargo ship was torpedoed and sunk in the Mediterranean Sea 38 nautical miles (70 km) south of Cape Palos, Murcia, Spain (37°10′N 0°28′W﻿ / ﻿37.167°N 0.467°W﻿ / 37.167; -0.467) by SM UB-105 ( Imperial German Navy). Her crew survived. |
| Ella Sayer | United Kingdom | World War I: The cargo ship was torpedoed and sunk in the English Channel 15 nautical miles (28 km) east by north of the Royal Sovereign Lightship (50°49′N 0°48′E﻿ / ﻿50.817°N 0.800°E﻿ / 50.817; 0.800) by SM UB-57 ( Imperial German Navy) with the loss of two of her crew. |
| Gnevny | Imperial Russian Navy | The Bespokoynyy-class destroyer was shelled and damaged by German artillery off Usakov Bulk near Sevastopol and beached, she was scuttled by her crew. Salvaged by the Germans in the Summer of 1918 and commissioned as R03 ( Imperial German Navy). |
| Isleworth | United Kingdom | World War I: The cargo ship was torpedoed and sunk in the English Channel 3 nautical miles (5.6 km) south west of Ventnor, Isle of Wight by SM UC-17 ( Imperial German Navy) with the loss of 29 of her crew. |
| Kafue | United Kingdom | World War I: The cargo ship was torpedoed and sunk in the Irish Sea 11 nautical miles (20 km) south west of the Mull of Galloway, Wigtownshire by SM U-86 ( Imperial German Navy) with the loss of a crew member. |
| Kalliope | United Kingdom | World War I: The sailing vessel was sunk in the Mediterranean Sea 45 nautical miles (83 km) off Alexandria, Egypt, by SM UC-74 ( Imperial German Navy). |
| Kempock | United Kingdom | World War I: The coaster was shelled and sunk in the Irish Sea 6.5 nautical miles (12.0 km) south east by south of the Copeland Islands by SM U-86 ( Imperial German Navy). Her crew survived. |
| SM UB-85 | Imperial German Navy | World War I: The Type UB III submarine foundered in the Irish Sea off Belfast, County Antrim, United Kingdom. All 34 crew were rescued by HMS Coreopsis ( Royal Navy). |
| Umba | United Kingdom | World War I: The cargo ship was torpedoed and sunk in the English Channel 1 nautical mile (1.9 km) south of the Royal Sovereign Lightship ( United Kingdom) by SM UB-57 ( Imperial German Navy) with the loss of twenty of her crew. |

## Unknown date

List of shipwrecks: Unknown date 1918 :
| Ship | State | Description |
| Cicero | United Kingdom | World War I: The cargo ship was scuttled in the Baltic Sea to avoid capture by the Germans. |
| Emilie | United Kingdom | World War I: The cargo ship was scuttled in the Baltic Sea to avoid capture by the Germans. |
| Michelet | France | World War I: The barque was sunk in the Atlantic Ocean off the west coast of Africa on or about 25 April by SM U-154 ( Imperial German Navy) with the loss of all 28 crew. |
| Obsidian | United Kingdom | World War I: The cargo ship was scuttled in the Baltic Sea to avoid capture by the Germans. |
| Prarial | French Navy | The submarine collided with a merchant vessel and sank with some loss of life. |
| SM UC-79 | Imperial German Navy | World War I: The Type UC II submarine struck a mine and sank in the English Channel off Cap Gris Nez, Pas-de-Calais, France during the first week of April with the loss of all 30 crew. |