Submarine
watercraft capable of independent operation underwater
HMS Olympus
HMS P48
HMS Parthian
HMS Porpoise
HMS Poseidon
HMS Proteus
HMS Rainbow
HMS Regent
HMS Regulus
HMS Rorqual
HMS Rover
HMS S1
HMS Severn
HMS Tantivy
HMS Templar
HMS Teredo
HMS Thames
HMS Thermopylae
HMS Tiara
HMS Tiptoe
HMS Tireless
HMS Totem
HMS Trenchant
HMS Trespasser
HMS Trump
HMS Truncheon
HMS Tudor
HMS Turpin
HMS Unbroken
HMS Unison
HMS Unruly
HMS Unsparing
HMS Unswerving
HMS Untiring
HMS Ursula
HMS Utmost
HMS Uther
HMS Varangian
HMS Virulent
HMS Walrus
HMS Gotland
Spanish submarine C-2
German submarine U-8
German submarine U-7
United States N-class submarine
T-1-class submarine
USS Halfbeak
French submarine Perle (1935)
HMS E9
Tramontana