It's quite easy (ok, really easy) to modify the game to start a career in the XVIII, even in the 1943 campaign. The only thing is you start out with some technologies (advanced radar, advanced sonar, etc) that arent normally available that early.
I dunno how long the H2O2 lasts for range, but I was able to do 25kts submerged, and something like 29 kts surfaced running on it.
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