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 as

Mark Hawkins as Lieut. Barlow, R.N