USS "Henry R. Mallory" (ID-1280) was a transport for the United States Navy during World War I.
 She was also sometimes referred to as USS "H. R. Mallory or as USS "Mallory.
 Before her Navy service she was USAT "Henry R. Mallory as a United States Army transport ship.
 From her 1916 launch, and after her World War I military service, she was known as SS "Henry R. Mallory for the Mallory Lines.
 Pressed into service as a troopship in World War II by the War Shipping Administration, she was torpedoed by the  in the North Atlantic Ocean and sank with the loss of 272 men—over half of those on board.
The Bermuda Triangle, also known as the Devil's Triangle, is a loosely-defined region in the western part of the North Atlantic Ocean, where a number of aircraft and ships are said to have disappeared under mysterious circumstances.
 Most reputable sources dismiss the idea that there is any mystery.
 The vicinity of the Bermuda Triangle is one of the most heavily traveled shipping lanes in the world, with ships frequently crossing through it for ports in the Americas, Europe, and the Caribbean islands.
 Cruise ships and pleasure craft regularly sail through the region, and commercial and private aircraft routinely fly over it.
Cyclops is an action-adventure novel by Clive Cussler.
 This is the 8th book featuring the author’s primary protagonist, Dirk Pitt.
 A wealthy American financier disappears on a treasure hunt in an antique blimp.
 From Cuban waters, the blimp drifts toward Florida with a crew of dead men—Soviet cosmonauts.
 Dirk Pitt discovers a shocking scheme: a covert group of U.S. industrialists has put a colony on the moon, a secret base they will defend at any cost.
 Threatened in space, the Russians are about to strike a savage blow in Cuba—and only Dirk Pitt can stop them.
 From a Cuban torture chamber to the cold ocean depths, Pitt is racing to defuse an international conspiracy that threatens to shatter the Earth!
USS "Antaeus" (AS-21/AG-67) – later renamed USS "Rescue" (AH-18) – was a commercial passenger liner acquired by the U.S. Navy during World War II and named USS "Antaeus".
 She was initially intended to be employed as a submarine tender; however she was modified and used as a transport for troops from 1942 to 1944.
 In 1945 she was commissioned as a hospital ship, renamed USS "Rescue", and played an important part in 1945 supporting Pacific Ocean attack and then liberation operations.
USS "U. S. Grant" (AP-29) was a transport ship that saw service with the United States Navy in World War II.
 Originally a German ocean liner named Konig Wilhelm II, she was seized by the United States during the First World War and renamed "USS Madawaska" (ID-3011) in 1917 before being renamed USS "U. S. Grant" (AP-29) in 1922.
Parablennius cyclops is a species of combtooth blenny found in the western Indian ocean, in the Red Sea.
USS "Cyclops" (AC-4) was one of four "Proteus"-class colliers built for the United States Navy several years before World War I.
 Named for the Cyclops, a primordial race of giants from Greek mythology, she was the second U.S. Naval vessel to bear the name.
 The loss of the ship and 306 crew and passengers without a trace within the area known as the Bermuda Triangle some time after 4 March 1918 remains the single largest loss of life in U.S. Naval history not directly involving combat.
 As it was wartime, there was speculation she was captured or sunk by a German raider or submarine, because she was carrying 10800 LT of manganese ore used to produce munitions, but German authorities at the time, and subsequently, denied any knowledge of the vessel.
 The Naval History & Heritage Command has stated she "probably sank in an unexpected storm" But the ultimate cause of the ship's fate is unknown.
The doldrums is a colloquial expression derived from historical maritime usage, which refers to those parts of the Atlantic Ocean and the Pacific Ocean affected by the Intertropical Convergence Zone, a low-pressure area around the equator where the prevailing winds are calm.
 The doldrums are also noted for calm periods when the winds disappear altogether, trapping sailing ships for periods of days or weeks.
 The term appears to have arisen in the 18th century, when trans-equator sailing voyages became more common.
 Since this zone is where two trade winds meet, it is also called the Intertropical Convergence Zone.
 They roughly lie between latitudes 5° north and south.
Kirby Robert Morrow is a Canadian actor, voice actor, writer and comedian of Irish ancestry.
 He was born in Jasper, Alberta and studied theatre at Mount Royal University in Calgary.
 He works in Vancouver, British Columbia.
 In animation, he is known as the voice of Miroku from "InuYasha", Van Fanel from the Ocean dub of "Escaflowne", Cyclops from "X-Men Evolution", Jay from "Class of the Titans", Teru Mikami from "Death Note", Trowa Barton from "Mobile Suit Gundam Wing", Ryo Takatsuki from "Project ARMS", Goku from Ocean's dub of "Dragon Ball Z" (from Episode 160 onwards), and Cole from "".
 On camera, he is known for the recurring role of Captain Dave Kleinman from "Stargate Atlantis".
Exercise Valiant Shield was a large United States military war game held 19–24 June 2006 in the Pacific Ocean.
 According to the Navy, Valiant Shield focused on cooperation between military branches and on the detection, tracking, and engagement of units at sea, in the air, and on land in response to a wide range of missions.
 The exercise involved 22,000 personnel, 280 aircraft, and 30 ships, including the supercarriers USS "Kitty Hawk" , USS "Abraham Lincoln" , and USS "Ronald Reagan" .
 It was the largest military exercise to be conducted by the United States in Pacific waters since the Vietnam War, and it was also the first time observers from the People's Republic of China were allowed to view U.S. wargames.
 The exercise marked the first of what will become biennial exercises involving different branches of the U.S. military.

Question: In what ocean did the USS Cyclops disappear?
Answer: North Atlantic Ocean