[pjc50]

I'm reminded of https://en.wikipedia.org/wiki/SS_Richard_Montgomery : 1,400 tonnes of explosives sunk in the Thames estuary. At least it's safeish as long as nobody touches it. The couple of nuclear reactors in subs that have already sunk are I believe in deep distant water, losing one inshore would be a serious problem.

[dredmorbius]

Nuclear submarines tend not to congregate in and/or near shipping lanes, as a general rule.

Their role in commerce is limited.

[dredmorbius]

... the point being, for nuclear-powered merchant traffic, that that does congregate near shipping lanes. Increasing consequent risk.