CHAPTER LIV.--Diving--The first diving-bell--Fixed apparatus supplied
with compressed air--The submarine hydrostat--Operations at Hell Gate--Diving apparatus--Submarine explosions--Improved diving dresses--Their use--Work of various kinds done with them--Instances of this--Seeking the treasure of the Hussar--Sunken ships in Sebastopol--Operations in Mobile--The Dry Dock at Pensacola Bay--The beauties of the submarine world--Habits of the fish--Possible depth of descent 594