Russian battleship Imperatritsa Mariya Imperatritsa Mariya ( : " Empress Maria " ) was an dreadnought of the Imperial Russian Navy , lead ship of her class . Construction began before World War I and she saw service with the Black Sea Fleet during the war . She provided cover for older pre - dreadnought battleships as they bombarded Ottoman facilities , although she engaged the ex - German light cruiser " Midilli " several times without inflicting anything more serious than splinter damage . " Imperatritsa Mariya " was sunk at anchor in Sevastopol by a magazine explosion on 20 October 1916 . She was subsequently raised , but her condition was very poor , and she was finally scrapped in 1926 . Description . " Imperatritsa Mariya " was long at the waterline . She had a beam of and a draft of . Her displacement was at load , more than her designed displacement of . She proved to be very bow - heavy in service and tended to ship large amounts of water through her forward casemates . The ammunition for the forward guns was reduced from 100 to 70 rounds each while the ammunition was reduced from 245 to 100 rounds per gun in an attempt to compensate for her trim . This did not fully cure the problem , but " Imperatritsa Mariya " was lost before any other changes could be implemented . " Imperatritsa Mariya " was fitted with four Parsons - type steam turbines imported from John Brown & Company of the United Kingdom . They were designed for a total of , but produced on trials . 20 mixed - firing triangular Yarrow water - tube boilers powered the turbines with a working pressure of . Designed speed was . Her maximum coal capacity was plus of fuel oil which gave her a range of at . All of her electrical power was generated by three Curtis 360 - kilowatt main turbo generator s and two 200 - kilowatt auxiliary units . Her main armament consisted of a dozen 12 - inch Obukhovskii Pattern 1907 52 - caliber guns mounted in four triple turrets distributed the length of the ship . Her secondary armament consisted of twenty 130 mm / 55 B7 Pattern 1913 guns mounted in casemate s . They were arranged in two groups , six guns per side from the forward turret to the rear funnel and the remaining four clustered around the rear turret . She was fitted with four anti - aircraft guns , one mounted on the roof of each turret . Four submerged torpedo tube s were carried , two tubes on each broadside abaft the forward magazine . Service . " Imperatritsa Mariya " was built by the Russud Shipyard at Nikolayev , Russian Empire . She was laid down on 30 October 1911 along with the Imperator Aleksander III and the Imperatritsa Ekaterina Velikaya , but this was just a ceremonial event as the design had not yet been finalized or the contract signed . She was launched on 19 October 1913 and arrived in Sevastopol on 13 July 1915 , where she completed her fitting out during the next few months and conducted sea trials . On 1 October she provided cover for the pre - dreadnoughts as they bombarded targets in Kozlu , Zonguldak and Karadeniz Ereğli . She did much the same when the older battleships bombarded targets in Bulgaria on 20 – 22 October and then Varna itself on 27 October . The light cruiser " Midilli " narrowly escaped from a running engagement with " Imperatritsa Mariya " on 4 April 1916 as the battleship narrowly missed her several times before she could disengage . Three months later both " Imperatritsa Mariya " and her half - sister , alerted by intercepted radio transmissions , sortie d from Sevastopol in an attempt to intercept the ex - German battlecruiser " Yavuz " as she returned from a bombardment of the Russian port of Tuapse on 4 July . " Yavuz " dodged north and avoided the Russians by paralleling the Bulgarian coastline back to the Bosphorus . " Midilli " mined the harbor of Novorossiysk on 21 July , but the Russians , again alerted by radio intercepts , attempted to catch her on her return journey . " Midilli " was lured into range of " Imperatritsa Mariya " s guns the next day when she pursued the Russian destroyer " Schastlivy " , but managed to escape with only splinter damage . On the morning of 20 October 1916 a fire was discovered in the forward powder magazine while at anchor in Sevastopol , but it exploded before any efforts could be made to fight the fire . However , sailors led by Engineer - Mechanic Michman Ignat ' ev had flooded the forward shell magazine before the explosion at the cost of their own lives . Their action probably prevented a catastrophic detonation , but all of the other magazines were flooded as a precaution . About forty minutes after the first explosion a second explosion occurred in the vicinity of the torpedo flat that destroyed the watertight integrity of the rest of the forward bulkheads . " Imperatritsa Mariya " began to sink by the bow and listed to starboard . She capsized a few minutes later , taking 228 sailors with her . The subsequent investigation determined that the explosion was probably the result of spontaneous combustion of the ship ' s nitrocellulose - based propellant as it decomposed . Following a complex salvage operation , the ship was eventually refloated on 18 May 1918 and moved into Sevastopol ' s Northern Drydock on 31 May , still upside down . However , in the chaos of the Russian Revolution and Civil War , no further repair work was done although her 130 - mm guns were removed . By 1923 the wooden blocks supporting her in place were starting to rot and she was floated out and grounded in shallow water in 1923 . She was approved for scrapping in June 1925 and officially stricken on 21 November 1925 , although the work did not begin until 1926 when she was refloated and moved back into the drydock . Her gun turrets , which had fallen out of the ship when she capsized , were later salvaged . Two of them were used as the 30th Coast Defense Battery defending the city during the Siege of Sevastopol during World War II .