The Deep (1977)
Gail Berke (Jacqueline Bisset) and David Sanders (Nick Nolte) are on a romantic holiday in Bermuda when they come upon the sunken wreck of a WWII freighter. Near it, they find an ampule of morphine, one of tens of thousands still aboard the wrecked ship. Their discovery leads them to a Haitian drug dealer, Cloche (Louis Gossett), and an old treasure hunter, Romer Treece (Robert Shaw). With Cloche in pursuit, Gail, David and Treece try to recover the sunken treasure.