A steel sphere, eight feet in diameter, is the latest device to aid in bringing sunken ships to the surface and in search for treasure lost in the depths of the sea. The sphere is equipped with a number of electrically operated devices to do the work. As it is lowered from its ship by means of a steel-wire cable, it throws beams from an electric searchlight to locate the wreck. If it is not found at once near the point where the vessel was lost, the bell brings its electrically driven propellers into action and moves about as desired, always in touch with the ship above by means of its cable, which carries telephone wires. When the searchlight has located the wreck, so that the men within the sphere can ascertain its position through the heavy glass windows, the bell is brought to the surface, and descends, carrying a large pontoon. The term pontoon as used in this sense means a water-tight cylinder placed beneath a submerged vessel and then filled with air to assist in refloating the vessel. These cylinders are equipped with motor-driven pumps for expelling their contents when the time comes for them to exert a lifting force. As most of the wrecks of recent years are of iron or steel, the bell makes use of the electro magnet in order to fasten a number of pontoons to the sunken vessel. This is done by approaching the hulk and allowing the four large magnets to lie against the side of the wreck. The magnets are then energized and the bell clings firmly to the hulk, holding on with the force of many tons. This allows a great drill, set between the magnets, to operate against the steel plates of the vessel, and a motor operates this drill so that a hole is bored in a very short time. Then, by an ingenious worm drive, the diving bell is shifted just a few inches to one side, after the drill is withdrawn. The pontoon carried down by the bell has been placed on the sea bottom meanwhile, below the spot where the device is operating. From this pontoon extend a number of chains, the loose ends of which are held up by floats. When the drill has bored a hole, one of these chains is gripped by an arm, also magnetized, which extends from the diving bell, and the pontoon hook on the end of the chain is set into the hole in the vessel, where it is automatically locked. The process of boring holes and inserting pontoon hooks is repeated until the pontoon is secured to the wreck by sufficient chains, after which the diving bell ascends for another pontoon, and attaches it in the same manner, continuing until the sunken vessel is encircled by these metal cylinders. The number required will vary according to the size of the vessel, of course.