Quote:
Originally Posted by RoaldLarsen
I seem to remember reading about one famous u-boat captain finishing off a victim with the 20mm.
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You're talking about Wolfgang Lüth. It is true that he did used 20mm rounds to sink a ship, but there are a few other things to consider in this story.
1. The Empire Whimbrel was already hit by torpedoes and received hits by the deck gun rounds as well.
http://www.uboat.net/allies/merchants/2859.html
2. The Notre Dame du Châtelet (I think this is the ship you're talking about) was a small wooden sailing ship of 488 tons, but still in order to be sunk rounds from
both deck gun and AA guns (20mm) were required
http://www.uboat.net/allies/merchants/ships/923.html
I hope this is useful to clear why 20mm rounds cannot (alone) sink a ship.