The Argonaut was a class of submarines built by engineer Simon Lake. When used without clarification generally refers to the second built and larger one launched in 1897 at Baltimore. She was 36-foot (11 m) long, cigar shaped and built of steel. She had a gas engine and propeller, dynamo, searchlight, and pumps for air and water. Her main attribute like that of the older sibling and predecessor Argonaut Junior (1894); was an air lock. The "Argonaut No 1", and "Argonaut No 2" are used as the name of this vessel. "Argonaut No 1" was built in 1897 and is 36 feet (11 m) in length, "Argonaut No 2" was a reconstruction of "Argonaut No 1" finishing in 1900 with a length of 60 feet (18 m) and significantly different profile.[1].[2][3]