How many Nuclear submarines have been sunk by accident with operating nuclear reactors.With the number of subs that have gone down I don’t see a reason to panic.
How much radiation is being emitted by those reactors is a wild guess but governments have’nt been worrying much.
Eight: List of sunken nuclear submarines
Not all of them were operating. At least 2 were shut down, but not defueled.
Russian open dumping in the Arctic