Prins Hendrik Dok I at the Rotterdamsche Droogdok Maatschappij with submarines in 1971. From left to right HNLMS Cornelis Drebbel (1915-1971), HNLMS Zeehond (1961-1990) and HNLMS Potvis (1965-1992). On Prins Hendrik I Tijgerhaai (1966-1972) under construction, and on the behind that Zwaardvis (1966-1972) under construction.
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