Japanese Type 1 submarine
Holland 1 Class Submarine purchased during the Russo Japanese War
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| Class overview | |
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| Builders: | Fore River Shipbuilding, Quincy, Massachusetts, USA |
| Operators: |
 Imperial Japanese Navy
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| Preceded by: | none |
| Succeeded by: | Kaigun Type 6 |
| In commission: | 1905–1921 |
| Completed: | 5 |
| Retired: | 5 |
| General characteristics | |
| Type: | Submarine |
| Displacement: |
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| Length: | 20.42 m (67.0 ft) |
| Beam: | 3.63 m (11.9 ft) |
| Draft: | 3.12 m (10.2 ft) |
| Installed power: |
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| Propulsion: |
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| Speed: |
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| Range: |
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| Test depth: | 45.7 metres (150 ft) |
| Complement: | 16 officers and enlisted |
| Armament: | 2 × 18 in (460 mm) bow torpedo tubes (2 × torpedoes) |
The No.1-class submarine (第一型潜水艦 Daiichi-gata sensuikan?) was the first class submarines of the Imperial Japanese Navy. Consisting of five vessels, these submarines were modified Holland-class vessels built in the United States.
The Japanese government was aware that the Imperial Russian Navy had obtained the Fulton, a prototype of the United States A-class or Plunger class in 1904 and had ordered an additional six vessels, designed by the Electric Boat Company and built in Russia under an 1904 emergency budget for use in the Russo-Japanese War. These vessels, known as the Som-class, were assembled in St. Petersburg and were designed to be transportable by train.
In order to counter this threat to naval operations against the Russian Pacific Fleet, the Imperial Japanese Navy also made a contract with the Electric Boat Company and its Fore River Shipyard subcontractor for the construction of five Type VII submarines, a more advanced design than the Russian version, which had been developed in Lewis Nixon's Crescent Shipyard in an unsuccessful bid for the US Navy’s United States B class submarine contract.
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