Departure submarines Walrus and Zeeleeuw from Waalhaven in Rotterdam for a 4 month trip to the West. Mr. Hr. Ms. Dan. As part of a Dutch contribution in the geophysical year, Walrus will perform a series of gravity measurements for the National Commission of Geodesy. Departure of the Walrus in the background De Zeeleeuw Date: 21 October 1957 Location: Rotterdam, Zuid-Holland Keywords: DEART, submarines Personal name: Waalhaven, Walrus Institution name: HM Zeeleeuw

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