I am looking for a movie that was probably released in the late 80s early 90s. All I can remember of the movie was that in the beginning someone was trapped in a crate and drowned in the ocean or sea or something and then an investigator shows up but there were plot twists in the movie and towards the end the detective gets trapped in the crate and they attempt to kill him by rolling him in the water as well. He ends up escaping and then when he gets out of the water the pieces of the puzzle start to come together and all the plot twists start to unravel. I apologize for being vague but I was young when I saw it. I also remember that when he escapes he is peering in through a window and the woman he was helping I think was having an affair with one of the murderers possibly....Any help would be appreciated!