The Russian submarine disaster in the Barents Sea has been more than a human tragedy.

Deep-sea rescue missions are few and far between because of the rarity of submarine disasters.

The incident was the worst Russian submarine disaster since the Kursk sank in 2000.

At least 20 people were killed by asphyxiation and at least 21 more were injured, marking the worst Russian submarine disaster since the Kursk sank in 2000.

Some residents said that the mysterious submarine disaster clearly shows that lives mean little here and that the government in the Kremlin has lost touch with people.

Not until ... he got in touch with me about the submarine disaster that led to our finding the artifact.

Measured by lives lost, historic context and significance, the sinking of Thresher was then, and remains today, the world's worst submarine disaster.

The sinking came three years after another submarine disaster in the same waters killed all 118 crew members.

The twin submarine disasters of 1968 provided a test of the new American approach to the deep.

The report's author, Joshua Handler, said the risk of submarine disasters could be rising because of "the bad times the Russian Navy faces."