Hi Steve,
Lets start with the sunken ship. Its the SARSIA an ex Trawler/Research ship built in 1953 in Dartmouth and was owned by the U.K. Marine Biological Association. In 1986 she was bought privately and a conversion to a luxery yacht was begun. However it appears the owner had a cash flow problem and all work was stopped and nothing happened for years. She was at that time berthed on the Wallasey Dock Road side of the East Float. The MDHB issued a writ on her for mooring fees and she was impounded. The MDHB then moved her to her current position where she sank one winters night some years ago and she has lain there ever since slowly settling into mud at the bottom of the dock.
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The strange black boat that you refer to is a Caission which is used to close Dock / Lock entrances when the gates are off and being repaired. It is floated over the lock / dock entrance and then flooded down onto the gates threshold where it seals the entrance to the waters.
Hope this explains everything.
Chris
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