Nonetheless, construction continued and on 11 October 1979, HNLMS Walrus was laid down. Furthermore, the design was constantly modified to incorporate new developments in the submarine world, which led to issues that slowed the building process. Soon, RDM noticed that the new submarines could not be built the same way as the Zwaardvis-class submarines it had to use new techniques to build the submarines. On 19 June 1979, Minister of Defense Willem Scholten signed a contract worth 425 million guilders with the Rotterdamsche Droogdok Maatschappij (RDM) to build two submarines to replace the Dolfijn-class submarines, with the construction of the second boat to commence the following year. Furthermore, there was a focus on automation which was aimed at decreasing the manpower required to operate the submarines, while also making them more effective against threats. For example, a special kind of French-produced steel was used to construct the hull of the Walrus-class submarines this steel proved to be more elastic, allowing submarines of the class to dive deeper than previous submarines. Walrus-class Zeeleeuw under construction in Rotterdam in 1987īetween 19, the design of the Walrus-class was for the most part completed, and included many improvements which would result in new, state-of-the-art submarines that would mark a significant improvement over previous submarines used by the Royal Netherlands Navy. Nonetheless, even with the diesel-electric submarine, the Dutch government sought to work together with international allies to reduce construction costs. This research initiative concluded that the Netherlands should build conventional diesel-electric submarines, as nuclear submarines were costly and could only be constructed, crewed, and maintained by countries with major navies such as the United States, France and the United Kingdom. Since the 1960s, the Royal Netherlands Navy had been conducting studies and research into a suitable replacement attack submarine. In 1974, the Royal Netherlands Navy announced, through the Ministry of Defence's 10-year plan Defensienota 1974, that it wanted to replace its aging Dolfijn-class submarines. The boats have been in service since 1990 and are all named after sea mammals. The Walrus-class submarine is the only submarine class currently in operation in the Royal Netherlands Navy. (20 × Honeywell Mk 48 torpedoes or Honeywell NT 37 C/D/E torpedoes.Thomson Sintra DUUX 5 passive ranging and intercept.Thomson Sintra TSM 2272 Eledone Octopus.3 x SEMT Pielstick PA4 200 VG diesel engines 6,300 hp (4,700 kW).Attack submarine class of the Royal Netherlands Navy
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