A stock Sh3 bug/quirk/feature, Engine upgrades enable the Sub to go faster, all fine. However when you take that engine upgrade plus a snorkel and run both diesel engine with the snorkel up, you go fast, a lot faster than you should. Another bug/quirk/feature, with or with out snorkel, run your sub at say 7-8m submerged, guess what, your sub goes faster than surfaced or fully submerged. I have also noticed that as you use torpedo's up, your sub can go slightly faster.
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