grandizer52

If The U-boats were "scuttled" they weren't submerged with the Main ballast tanks only. all Uboats had 3 forms of emergency scuttling. one was a Plug under the Navagation/chart table. the whole table is the scuttle plug. there's also a compartment flood valve aft of the helm/planes hydraulic operator (starboard side). the last would be explosive charges in both torpedo rooms, but rarely used. the U-505 had all 3 actuated whe n boarded, but the plug was found, the charges got soaked, and the valve wasn't opened enough to cause what submariners would call flooding.
my 2 cents
laytah
steve