James Franciscus

as Lt. Comdr. Jeffords, R.N.V.R.

Elizabeth Shepherd

as Alison

Ronald Allen

as Comdr. Ashurst, R.N.

Magda Konopka

as Luciana

Drewe Henley

as Sub. Lt. Johnson, R.N.

Reuven Bar-Yotam

as C.P.O. Yacov

Inigo Jackson

as C.P.O. Stanhope

Philip Madoc

as 'E' Boat Captain

Moultrie Kelsall

as Vice Admiral Ashurst

David Savile

as Lieut. Wallace, R.N.

Takis Emmanuel

Mark Hawkins

as Lieut. Barlow, R.N