Dai-ichi Sensuikan (1905)
Dai-ichi sensuikan was the first Japanese submarine. One of five Holland VII types purchased from the US by Japan, she was laid down in 1904 at the Fore River Shipyard, and shipped in pieces to Japan in 1905 for completion. Commissioned 31 July, 1905, she was completed too late for service in the war with Russia. Dai-ichi carried two 460mm (18") torpedoes in two tubes in the bow, and displaced 105 tons on the surface. Top speed on the surface was 8.8 knots, reducing to 6.8 knots when submerged. Used mainly as a training ship, she was reclassified as a 2nd class submersible in 1916, and 3rd class submarine in 1919, before she was decommissioned 30 April, 1921.