I think that if the Type VIIC/42 u-boats were built they would have been almost invincible, no? Just look at how deep they can dive! 1,500 FT or deeper crush depth!! Once they fired all their bow or stern tubes they can just dive to 1,000-1,500 FT and wait it out? Surely there were no depth charges that can go that deep?
Not a fan of u-boats at all (American Fleet Boats FTW!!! Balao class w000h00000!!!), but the diving capabilities of the 42 stunned me.