Blockship
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A blockship is a ship deliberately sunk to prevent a river, channel, or canal from being used as a waterway. It may either be sunk by a navy defending the waterway to prevent the ingress of attacking enemy forces, as in the case of HMS Hood at Portland Harbour in 1914; or it may be brought by enemy raiders and used to prevent the waterway from being used by the defending forces, as in the case of the three old cruisers HMS Thetis, Iphigenia and Intrepid scuttled during the Zeebrugge raid in 1918 to prevent the port from being used by the German navy.
The wreck of SS Reginald, a blockship sunk in Weddell Bay in the Orkney Islands, Scotland in 1915
The Viking Ship Museum in Roskilde is Denmark's national ship museum for ships of the prehistoric and medieval period.
The Viking Ship Museum
Waterside of the Viking Ship Museum as seen from Roskilde Fjord
The Viking Ship Museum possess a large collection of authentic historic boats and reconstructions from all over Scandinavia.
A look down the halls