Diamond Connection (1982)

"Diamond Connection" is a 1982 Crime movie directed by Sergio Bergonzelli and starring by William Berger, Gordon Mitchell. Crashed and sunken in a murky sea, a passenger plane had a very special package... a briefcase full of diamonds. These illegally acquired and transported missing diamonds become an irresistible challenge to a few interest groups. They will kill, deceive, and plot to capture the diamonds for themselves.