Screenplay by DONALD JAMES   Directed by PAUL DICKSON     An assassination attempt in a submarine provides the Champions with tense under-sea drama.     Protecting a visiting President from an East European state is always a worrying assignment, but for two of the Champions, Richard (WILLIAM GAUNT) and Sharron (ALEXANDRA BASTEDO), the danger appears to be over, temporarily at least, when the subject of their assignment, President Drobnic (HENRY GILBERT), is safely under-water in the submerging nuclear submarine he is inspecting with his wife (VIOLA KEATS).   But an assassination attempt has already been put in hand by the placing, among the ship’s stores, of a remote control explosive device.   The explosion causes the ship to sink to the sea-bed, badly damaged and with contact cut off. The captain is killed and the President so severely injured that an immediate operation is necessary. Only one person aboard has the ability to carry out the operation, and that is Sharron, and she can do this only if the submarine remains still. But the only possible way of bringing the vessel to the surface is to pump out the forward hatches and the movement would undoubtedly kill the President. Richard, acutely aware of the international repercussions of his death, orders the pumping to be delayed until the operation can be completed.   It’s a gamble with the lives of everyone on board and it meets with violent opposition from Raven (MIKE PRATT), the civilian engineer who is carrying out tests with a skeleton crew, and another civilian worker, Jackson (LAURIE ASPREY).   Richard has to take strong action. The operation goes on, and as it does so the supply of oxygen becomes less and less. Men are losing consciousness. Civilians on board begin to panic. But the operation is a success and instructions are given for the pumping to begin.   Raven is forced to show his hand when, with the President still alive, he attempts to shoot him but is foiled by Richard. The chances of anyone surviving are becoming increasingly remote, but it is Craig Stirling (STUART DAMON) who, from shore base, is able to use his uncanny telepathic contact with Richard to make the surfacing possible and also to reveal the truth about the assassination plot...     AN PRODUCTION   Series created by Monty Berman and Dennis Spooner   © Copyright Incorporated Television Co. Ltd. MCMLXVII     Stuart Damon   Alexandra Bastedo   William Gaunt   Anthony Nicholls     Craig Stirling   Sharron Macready   Richard Barrett   Tremayne     Mike Pratt   Peter Howell   John Turner   John Stone   Viola Keats   Henry Gilbert   Laurie Asprey   Rio Fanning     Raven   Admiral Cox   Lieut.-Com. Street   Naval Captain   Madame Drobnic   Drobnic   Jackson   Telegraphist     Associate Producer   Director of photography   Art director   Editor     Johnny Goodman   Frank Watts   Charles Bishop   Derek Hyde-Chambers     Musical director   Theme composed by   Post-production supervisor   Production manager   Casting   Stunt arranger     Edwin Astley   Tony Hatch   Philip Aizlewood   Malcolm Chistopher   Judith Jourd   Bill Sawyer     Sound editor   Sound recordists     Music editor   Associate art director   Set dresser   Construction manager     Roy Lafbery   Len Abbott Claude Hitchcock   Alan Willis   John Graysmark   Brian Rider   Bill Greene     Camera operator   Assistant director   Continuity   Special effects     Harry Gillam   Denny Lewis   Annabel Davis-Goff   Sid Pearson     Scenic artist   Production buyer   Make-up supervisor   Hairdressing   Wardrobe supervisor   Supervising electrician     A.J. Van Montagu   Sid Palmer   Gerry Fletcher   Michael Jones   Laura Nightingale   Ted Hallows       Made on location and at ASSOCIATED BRITISH ELSTREE STUDIOS ENGLAND.