HMS Sealion Wikipedia
HMS Sealion was the name of several ships and at least one land base of the Royal Navy.HMS Sealion (72S) - an S class submarine active during World War II
HMS Sealion (S07) - a Porpoise class submarine of the Cold War period
The Royal Navy's name for RAF Ballykelly, Northern Ireland. The Joint Anti-submarine School was located there along with several Fleet Air Arm units.