 Ostrovsky concedes that both his and Ferraday's missions are effectively accomplished, at least in part, and leaves, allowing "Tigerfish" to complete the rescue of the civilians.A dissolving segue shows a teletype machine churning out a news story hailing the success of the "humanitarian" mission as an example of cooperation between the West and the Soviet Union, while "Tigerfish" sails for home.The film rights to the 1963 novel were acquired the following year by producer Martin Ransohoff, who hoped to capitalize on the success of the 1961 blockbuster "The Guns of Navarone" by adapting another Alistair MacLean novel for the silver screen as a follow-up.