Wait till a VII becomes available to you. The VIIB comes up later in '39 iirc. It's a huge improvement over the type II series as you get much longer range and about 3 times as many torps. It's easily a worthwhile upgrade at the time.
Going to a VIIC probably isn't worth the wait at first, but it comes in handy later in the war with the better upgrades. The 3 seconds it shaves off your dive time are extremely welcome also.
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