On the 31st of August, 1986 Soviet passenger liner the SS Admiral Nakhimov collided with another ship and sank in the Black Sea. 423 of the 1234 people on board, most of them Ukrainian, were killed.
The Nakhimov began its life as a German hospital ship in World War Two, and was later remodelled by the Soviets.
The ship sank so fast that there was no time to release the lifeboats, which resulted in such severe casualties.
The communist officials did not allow the disaster to be reported for forty-eight hours.