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MT Unirea
MT ''Unirea'' was a Romanian-flagged crude oil carrier, one of the biggest ships of the Romanian commercial fleet. She broke up and sank in 1982 in the Bulgarian waters of the Black Sea, south-south east of the Cape Kaliakra at a depth of after a mysterious explosion. The crew totalled 43 members of which 42 were rescued by Romanian and Soviet boats. The sinking of ''Unirea'' was classified by Lloyd's List as the largest ship accident of 1982.
==Investigations==
The exact cause of accident is unknown but official reports suggest that during a vapor evacuation of the central number 3 tank an explosive mixture formed alongside the evacuation hole that could have been ignited by multiple sources but especially electrostatic energy. The explosion of the central number 3 tank had a devastating effect on the integrity of the ship triggering a series of explosions that destroyed the separating wall of the central and starboard tanks favoring the expansion of the volatile elements across the ship. The fire that followed also contributed to the vertical breaking of the ship's shell and the eventual sinking. Other official reports claim that the accident was caused by a collision with a World War II mine. A different opinion (unofficial) came from some naval architects and marine engineers stating that the ship broke up because of incorrect ballasting (the ship had no cargo at the time of the accident).〔
The Romanian shipping company "Navrom" claimed the insurance payout, amounting to US$36.6 million. This action resulted in a thorough inspection of the ship's wreck by independent survey teams, employed by the insurance company from Lloyd's Register, Japan. As the inspection did not reveal any major faults in construction, the insurance was finally paid.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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