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Dolfijn-class submarine
Hr. Ms. Dolfijn (1960) 1.jpg
Dutch submarine HNLMS Dolfijn (1960)
Class overview
Name: Dolfijn
Operators:  Royal Netherlands Navy
Built: 1954-1966
In service: 1960-1992
Completed: 4
Retired: 4
Preserved: 1
General characteristics
Type: submarine
Displacement: 1,530 tons (surfaced)
1,826 tons (submerged)
Length: 79.5 m
Beam: 7.8 m
Draught: 5.0 m
Propulsion: 2 shafts, diesel electric. 2 MAN type diesels (2800 hp) and two electric motors 4000 hp
Speed: 14.5 knots (surfaced)
17 knots (submerged)
Complement: 67
Sensors and
processing systems:
Radar type 1001, Sonar: passive and active
Armament: 8 533mm (21 inch torpedo tubes) 4 bow, 4 stern, 16-22 torpedoes, fitted for minelaying via torpedo tubes

The Dolfijn class submarines of the Royal Netherlands Navy are a class of four submarines, the Dolfijn, Zeehond, Potvis and Tonijn, Which were built in the late 1950s and the early 1960s. They were the first indigenous submarines built for the Netherlands Navy after World War II.


The Dolfijn class is a special Dutch design and has three separate pressure hulls arranged in a triangle and enclosed in external steel casing. The upper hull for the living/working part of the crew and the lower two hulls were for the engines, batteries and storage rooms. This allows the submarine to dive much deeper than other submarines from the late 1950s, with a maximum diving depth of 200 m. The designer was F Gunning.

The order for second group of boats, also known as the Potvis class was postponed in the late 1950s while the possibility of building a nuclear powered submarine was considered and rejected. The order for two boats was re-instated in 1962. These boats had their diesels replaced and electronics updated in 1978-79.

The Zeehond was converted into a trials ship by RDM shipyard in Rotterdam in 1990 and used as a technology demonstrator for a closed cycle diesel air independent propulsion system until 1994.

The Boats

Ship Builder Laid down Launched Commissioned Fate
Dolfijn Rotterdamse Droogdok Mij 30 December 1954 20 May 1959 16 December 1960 Broken up 1985
Zeehond Rotterdamse Droogdok Mij 30 December 1954 20 February 1960 16 March 1961 Test ship 1990, Scrapped 1997
Potvis Wilton-Fijenoord, Schiedam 17 September 1962 12 January 1965 2 November 1965 Decommissioned 1992, Broken up 1994
Tonijn Wilton-Fijenoord, Schiedam 26 October 1962 14 June 1965 1965 24 February 1966 Decommissioned 1991, preserved in the Dutch Navy Museum in Den Helder.

References and external links

  • Conway's All the World's Fighting Ships 1947-1995
  • Specifications and histories [1]
  • Illustrated information on Tonijn [2]

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