if you have a google i.e.
http://www.flickr.com/photos/63164772@N05/6596674635/http://www.swanseadocks.co.uk/POW%20Dock%202.htmStream Fisher
In September 1952, whilst loading a cargo of anthracite at No. 5 Hoist in the Prince of Wales Dock, water began to flood the engine room of the ‘Stream Fisher’ as some of the ship’s port-holes had inadvertently been left open. A joint effort to pump out the vessel was made by the Swansea Fire Brigade and the Britannia Towing tug ‘Clyneforth’, but this was to no avail and the ‘Stream Fisher’ eventually sank with her port side resting on the bottom of the dock. Fortunately there were no casualties, and the ‘Stream Fisher’ was successfully raised a few weeks later