J. Duffield - The Radio Boys Under the Sea - or, The Hunt for Sunken Treasure

“Now as to supplies. We’ve got to take along guns, revolvers and plenty of ammunition. Then we’ll need dynamite and blasting powder – ”

“I don’t see exactly where that comes in,” remarked Tom.

“For use in getting to the treasure,” explained Benton. “Granted that we locate the ship, it’s altogether unlikely that we’d be able to get through the hatches. They’d in all likelihood be crusted with barnacles or covered with silt and sea growths that would make it impossible for the diver to get into the hold unaided. But he could plant a charge of dynamite, and then after he’d been drawn up the charge could be fired by means of an electric spark from a battery in the boat above. That would tear a big hole in the deck and give the diver a chance to get in.

“Speaking of the diver,” Benton went on, “brings us to one of the most important things of all, and that is the diving suit. We can’t afford to get any but the best, for the man that goes down in it literally takes his life in his hands. The work though is less dangerous than it used to be because of the improvements that have been made.

“For instance, in the old-fashioned suits the fresh air was served to the diver from the surface of the water through a tube and the pressure within the suit was increased to equal the pressure outside of it. But the more modern suit that I have in mind eliminates the necessity of the air tube. The diver carries his own oxygen with him in a tank that is fitted into a steel shell that is a part of the suit. Beside the oxygen tank is another tank containing caustic soda which absorbs the carbon dioxide given out by the expelled breath of the diver. A valve operates to deliver a certain amount every hour of oxygen properly mixed with nitrogen.

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