- Country: UK
- Genres: Action, Drama, War
- Release: 1968-03-22
- Director: William A. Graham
- Writers: Donald S. Sanford , Guy Elmes , John C. Champion , Edmund H. North (1911–1990)
- Language: English
- Stars: James Caan , David Sumner , Norman Bowler , Brian Grellis , Paul Young , William Dysart , John Kelland , Kenneth Farrington , Keith Alexander , Carl Rigg
- Runtime: 89 min
- Awards: N/A
- AKA: 潜水艦X-1号 (Japan) , Submarine X-1 (Canada) , Denizaltı X-1 (Turkey) , Submarine X-1 (United States of America) , Submarine X-1 (Australia) , Sous-Marin X-1 (Belgium) , Submarino X-1 (Spain) , Submarine X-1 , Sfida negli abissi (Italy) , Βυθίσατε το Λίντεντορφ (Greece) , Submarino X-1 (Brazil) , Субмарина Х-1 (Russian Federation) , Submarinul X-1 (Romania) , El submarino X-1 (Mexico) , Az X-1-es tengeralattjáró (Hungary) , Ubåd X-1 (Denmark) , Submarine X-1 (United Kingdom) , Tauchfahrt in die Hölle , Łódź X-1 (Poland) , Подводница X-1 (Bulgaria) , Submarí X-1 (Spain) , Sous-Marin X-1 (France, French Republic) , Ubåt X-1 till attack (Sweden) , Le Raid suicide du sous-marin X1 (France, French Republic) , Sukellusvene X-1 (Finland) , Submarino X-1 (Chile) , Submarine X1 , Submarino X-1 (Portugal, Portuguese Republic) , DuikBoot X-1 (Belgium)
- Plot: After losing a submarine and fifty crew in a battle with a German ship during WWII, a Royal Navy officer gets a second chance in a daring raid with midget subs.
- IMDB:tt0063655
Submarine X-1 Cast · · · ALL
William A. Graham
Director
James Caan
Cmdr. Richard Bolton, RNVR
David Sumner
Lt. Davies R.N.V.R
Norman Bowler
Sub-Lt. Pennington, RN
Paul Young
Leading Seaman Quentin
Brian Grellis
CPO Barquist X 3
William Dysart
Lt. Robert Talbot Gogan R.N.R.
John Kelland
Sub-Lt. Keith Willis, RNVR
Kenneth Farrington
CPO Boker Knowles
Carl Rigg
CPO Norman Kennedy
Steve Kirby
Leading Seaman X-2
Nick Tate
Leading Seaman X-1
George Pravda
Capt. Erlich of the 'Lindendorf'
Rupert Davies
Vice Admiral Redmayne (uncredited)