I`m sure we are talking here about a well documented bug. "Super destroyers" are from time to time staying in your vicinity and you can do what you want - they will stalk you forever.
You can
a) reload the saved game
b) move to an island or to the coast and the destroyer will stupidly crash into the rocks and sink
It has nothing to do with the IRAI or other mods. Hope it is helpful.
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