Loss of Bouyancy
The easy way to increase bouyancy is to blow air into the tanks. This could be done in an emergency but would take surface time to replace the compressed air.
You don't pump water at depth you displace it with air. It's noisy and agiveaway to surface DD Sonar operators. Without the air to displace the volume of water removed the tank would crush like a can...
We gave them some things in exchange ofr the magnetron and other secrets, that included the torpedoe trigger. Being we found them defective and in need of repair does not surprise me that the British Sub fleet did the same. Lend Lease also transfered a number of S Boats tothe the Brits and the Poles along with their Warloads....
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