The recovered parts or components are believed to belong to the submarine.
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In 2000, the Russian nuclear sub Kursk exploded and sank during maneuvers in the Barents Sea.
In 2019, a fire broke out on one of the Russian navy's deep-sea research submersibles, killing 14 sailors.
Argentina deployed a Type 209 during the Falklands War against Britain.
The cause of the disappearance is still uncertain.