During World War II, U.S. Navy scientists working in Cuba attempt to find an effective shark repellent to be used by servicemen stranded in shark-infested waters.During World War II, U.S. Navy scientists working in Cuba attempt to find an effective shark repellent to be used by servicemen stranded in shark-infested waters.During World War II, U.S. Navy scientists working in Cuba attempt to find an effective shark repellent to be used by servicemen stranded in shark-infested waters.