I came to the realization that this was the original prelude to the 2005 remake "Into the Blue" about half way through the film. This is a classic film starring three of the top actors from their time period and the suspenseful storyline is definitely entertaining. The original is no better, no worse than the remake, but I hate seeing the original after the remake for the simple concept that modern Hollywood magic tends to overcompensate any classic.
6/10