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Surely there are worse cases for a sub than this?

The idea is that you are not going to have a meltdown even in a badly malfunctioning reactor.

Is it? It's not at all difficult to stock enough seawater to flood a terrestrial plant. What's distinguishing the submarine?

Smaller size than commercial power station reactors, easier to keep cool.

This contradicts the comment I responded to, though. The scenario is that we've already failed to keep it cool.

There is less of it to cool.

A submarine (when submerged) has a large body of water for heat to radiate out into.

A (previous generation) terrestrial plant already has systems that can dump ludicrous amounts of water onto the core, but they all rely on there being power to operate pumps. A nuclear submarine that can dump in sea water does not need this - the body of water it is in is cold enough (relative to the heat in the core) that it will naturally carry heat away.

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