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The Russians have had nuclear powered icebreakers since the late 1950s.[0]

The Russians have also left broken nuclear reactors at the bottom of the sea, because they don't care about the environment very much.

Or: they have correctly identified that environmental harms from a small amount of fissile material in the ocean are so negligible it rounds to zero.

Compared to the very real harms caused by oil leaking from existing cargo ships this would be a massive upgrade.

that's less of a problem than air pollution or global warming.