Types II - VII - IXC
94 conventional German U-boats were scuttled during Operation Deadlight, they were of types IID, VII, IXC and IXD.
The Elektro boats
The 22 Elektro boats that became victims to this operation. 4 of the larger type XXI.
http://uboat.net/fates/deadlight.htm Operation Deadlight was the code name for the Royal Navy operation to scuttle German U-boats surrendered to the Allies after the defeat of Germany near the end of World War II.
https://en.wikipedia.org/wiki/Operation_Deadlight