I haven't reached the date end so that might be it. It also turns out I didn't sink the Royal Sovereign even though I hit it with 5 (non-dud) torpedoes, it appears the depth isn't great enough for the ship to actually "sink", it just rests on the bottom even though the whole thing exploded. This is pretty weird since the Renown appeared to be at similar depth and it only took 2 torpedoes.
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