<p>De Tonijn is een driecilinder onderzeeboot van de Potvisklasse. Dit type vormde tussen 1960 en 1991 de kern van de Nederlandse onderzeedienst. Het schip werd in het begin van de 60-er jaren van de 20ste eeuw gebouwd door Schiedamse scheepswerf Wilton-Fijenoord. De onderzeeboot Tonijn maakt sinds de zomer van 1994 deel uit van het Marinemuseum.
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The Tonijn  is a three-cylinder submarine of the Sperm Whale class. This type of submarine formed the heart of the Netherlands submarine fleet between 1960 and 1991. It was the Dutchman Ir. M.F. Gunning who developed the principle of the three-cylinder submarine. Its construction made for strongly improved stability and enabled the boat to dive deeper than other submarines of its time. Between 1966 and 1991 the Tonijn took part in a large number of squadron voyages and carried out several operational missions. The boat has an overall length of 79.5 meters and a weight of one million kilograms.
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