cast
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Dermot Walsh
Guy Thornton
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Hazel Court
Margaret Thornton
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Joss Ambler
Yacht Port Manager
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Hugh Burden
Dr. Fawcett
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Mignon O'Doherty
Mrs. Manley
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Hugh Latimer
Peter
- Joan Carol Mrs. Martineau
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John Robinson
Prof. Martineau / Mansel
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Joss Ackland
Ron, 2nd Fisherman
- John King-Kelly Sid, 3rd Fisherman
- Laidman Browne Coroner
- Meadows White Mr. Leech, Surveyor
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Patricia Owens
Party Girl (Joyce)
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Melissa Stribling
Party Girl (Vera)
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Ian Carmichael
Bernard
- Geoffrey Dunn Strange Passenger
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Pat McGrath
Bert, 1st Fisherman