HNLMS Amstelstroom was originally a coastal transport vessel of the Hollandsche Stoomboot Mij. of Amsterdam. The ship was requisitioned by the Royal Netherlands Navy after the start of the German invasion of the Netherlands to serve as a makeshift submarine tender.Mark, Chris (1997). Schepen van de Koninklijke Marine in W.O. II. Alkmaar: De Alk. ISBN 978-90-6013-522-8.
Service history The coastal transport ship Amstelstroom was requisitioned on 11 May 1940, one day after the start of World War II for the Netherlands together with other civilian ships. The Royal Netherlands Navy foresaw the need of additional submarine tenders in Dutch waters as the only other such ship was , causing them to requisition some ships such as Amstelstroom and .
HNLMS Amstelstroom was initially be used to transport torpedoes, ammunition and other spare parts for maintaining Royal Netherlands Navy ships from Amsterdam to Portsmouth. Once the Netherlands had fallen, the ship served alongside HNLMS Mulan as a submarine tender at Dundee, Scotland, before being returned to its owner on 25 September 1940. The ship survived the war and continued its transport role until its eventual retirement.
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