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MADRID: A US-sanc­ti­o­ned Russian cargo ship that sank in the Medit­erranean Sea in 2024 was carrying “nuclear reactor components” similar to those used in nuclear submarines, according to a Spanish government letter, shedding some light on the mystery.

The Ursa Major, owned by a company that belongs to the Russian defence ministry, sank in international waters off southern Spain in December 2024 with 16 people on board — two of whom were never found.

The captain finally “confessed” that the ship was transporting “components of two nuclear reactors similar to those used by submarines”, reads a government letter to parliament dated Feb 23.

The captain said the reactors “were not carrying nuclear fuel”, but this information could not be verified, added the letter, cited in a CNN article published on Tuesday.