The flotilla was initially composed of U Class submarines including HMS Unbeaten, HMS Upholder, HMS United, HMS Upright, HMS Una, HMS Unseen, HMS Unbending, HMS Unbroken, HMS Urge, HMS Utmost, HMS P38 and HMS Ursula (N59) together with ORP Sokół and ORP Dzik of the Polish Navy 
The flotilla's base in Malta was the ancient fort on Manoel Island, in the Marsamxett Harbour opposite Sliema; this shore base was called HMS Talbot.
The submarine base at Manoel Island was a priority target for Axis aerial attacks and was heavily bombed in 1942 which forced a temporary withdrawal of the flotilla from Malta.

The flotilla never numbered more than 12 submarines, but this small force between January 1941 and December 1942, sank 412,575 tons of Axis shipping.

On 24 May 1941 while assigned to the flotilla HMS Upholder attacked a convoy off the coast of Sicily and sank the 18,000 ton liner Conte Rosso.
Upholder's captain, Lieutenant Commander Malcolm Wanklyn, was awarded the Victoria Cross for both this and also for completing many successful patrols.
The flotilla was initially composed of U Class submarines including HMS Unbeaten, HMS Upholder, HMS United, HMS Upright, HMS Una, HMS Unseen, HMS Unbending, HMS Unbroken, HMS Urge, HMS Utmost, HMS P38 and HMS Ursula (N59) together with ORP Sokół and ORP Dzik of the Polish Navy 
The flotilla's base in Malta was the ancient fort on Manoel Island, in the Marsamxett Harbour opposite Sliema; this shore base was called HMS Talbot. The submarine base at Manoel Island was a priority target for Axis aerial attacks and was heavily bombed in 1942 which forced a temporary withdrawal of the flotilla from Malta.
The flotilla never numbered more than 12 submarines, but this small force between January 1941 and December 1942, sank 412,575 tons of Axis shipping.
On 24 May 1941 while assigned to the flotilla HMS Upholder attacked a convoy off the coast of Sicily and sank the 18,000 ton liner Conte Rosso. Upholder's captain, Lieutenant Commander Malcolm Wanklyn, was awarded the Victoria Cross for both this and also for completing many successful patrols.
10th Submarine Flotilla