Not sailing but water related is "raising the dead" or "Diving into Darkness" by Phillip Finch.
Its the story of the deep cave diver Robert Shaws fatal attempt to recover a body in one of the deepest caves ever attempted, 900 feet. An amazing twist at the end, and a real insight into this sport.
As a taster there is a youtube of the dive, not for the faint of heart...
http://uk.youtube.com/watch?v=mF4iFJ-G74oGareth
