In the first Pirates of the Caribbean film, we know that Bootstrap Turner (Bill Turner) is thrown to the bottom of the ocean by Barbossa and his crew. He may be alive due to the curse until it is broken at the end of the first movie.
However, in the second movie, he comes to Jack Sparrow to give messages from Davy Jones. So how does he end up with Davy Jones from the bottom of the ocean. I believe he says something to Jack, but I am not able to understand fully. What deal did he make and why?