Wreck-Diving.org

Well, there was a movie I watched few years ago but I can’t remember what. Its about a black man who is learning how to dive with a Deep Sea Diving suit. Somewhere in the movie, they find a missile, but the boat can’t lift it so the string snaps, and cuts the mans leg off. The only way he could dive again, if he took a certain amount of steps with his " fake " leg. Please Help. Thank You