Baltic radioactivity and a possible submarine leak

Could increased radioactivity reported in the Baltic Sea have come from a leaking Russian nuclear submarine?

Possibly, given the age of some boats, but the cause was unknown and the discussion offered only a suspicion.

Reports of increased radioactivity in the Baltic Sea prompt a question about whether a Russian nuclear submarine might be leaking. The response remains explicitly speculative: something may be having trouble, but the source and cause were unknown. The age of some Russian submarines made that explanation seem disturbingly plausible in June 2020. No vessel is identified, and the exchange supplies no evidence that a submarine was actually responsible.