In shallow water I've watched many escort's blow themselves up from their own depth charges. The captain's stupidity in (his lack of knowing how to) accelerating is one of the few things you can use to your advantage in shallow waters/inside a port to blow one up without using an eel (or if you're out). It is tricky but you need to work yourself into position such that he makes his run and drops his charges and is forced to abruptly stop (either a wall or ship becomes his immediate obstacle) and he'll blow himself up in a mater of seconds.
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