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The Argonaut Junior was the first successful submarine built by engineer Simon Lake. Her main attribute, like that of the sub built by Lake in 1897, Argonaut (submarine), was an air lock. Her dimensions were length 14ft, beam 4 ft, depth 5 ft. Different sources incorrectly identify "Argonaut No 1", and "Argonaut No 2" as the name of this vessel. "Argonaut No 1" was built in 1897 and is 36 feet in length, "Argonaut No 2" was a reconstruction of "Argonaut No 1" finishing in 1900 with a length of 60 feet and significantly different profile.
The Argonaut Junior was built in 1894 as a prototype by Lake after he was denied a contract by the U.S. Navy. It was triangular, made of wood (Yellow Pine), and had three wheels to keep it from getting stuck to the sea bottom. She moved along the bottom of Sandy Hook Bay by one or two men cranking the axle of the two driving wheels. With sufficient air pressure in the cabin, a bottom door (air lock) could be opened and no water would come into the boat. Then by putting on a pair of rubber boots the operator could walk around on the sea bottom and push the boat along with him and pick up objects from the sea bottom.
