Then there is also Italian 10th Flotilla (
Decimo MAS).
"That changed dramatically on 19 December. Six frogmen from the elite Italian 10th Flotilla (
Decimo MAS) were dropped off from a submarine one and a half miles outside the harbour, each armed with a single torpedo. They were able to enter the harbour while the nets were opened to allow some destroyers into the harbour. They then planted their torpedoes under
Valiant and
Queen Elizabeth, badly damaging both ships. Admiral Cunningham managed to keep the damage secret, conducting business from the decks of
Queen Elizabeth as normal, but for some time there were no British battleships in the eastern Mediterranean."
HMS Queen Elizabeth