I have begun to help a local dock builder with some jobs around the lake. I am wondering what would be the best method for hammering nails into wood. For this job the guy says he has a underwater nail gun that can shoot about 6 inches but the nails would have to be finished by hand. Also the gun apparently doesn't work past a depth of 8ft so anything below that would be need to be done by hand. Am I going to have to carry a sledge hammer down there or what? Thanks for the replies