A submarine (or sub) is a watercraft capable of independent operation underwater. It differs from a submersible, which has more limited underwater capability.
WW2 British HMS Upstart 1942 Royal Navy U Class Submarine Bronze Badge
HMS Explorer Submarine Boat Badge
British, Pre WW1, HM Submarine Holland 1 – Four Original Photographs
French, c1888, Submarine Le Gymnote – Original Photograph*
British, 1963, HM Submarine Valiant (S102) – Two Original Photographs
British, 1963, HM Submarine Valiant (S102) – Fourteen Original Photographs
British, 1986, HM Submarine Spartan – Original Photograph
British, 1967, HM Submarine Resolution (S22) – Three Original Photographs – one with Crown Copyright
British, 1968, HM Submarine Churchill – Original Photograph
British, 1983, HM Submarine Trafalgar – Two Original Photographs (One with HMS Illustrious), with Royal Navy Stamp