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Sunrise this morning. I froze my fingers getting this. As you can see, the dock is not an inconsiderable body of water. It was designed for ocean ships (albeit not of today's scale), and would have assumed that it contained salt walter, though I suppose it may have been years since the lock fully opened to exchange water with the Thames Estuary, and it may well be fed fresh water from culverts and storm drains. Even so, frozen water means it's cold. (Something to bring you back to reality after that last warm sunny summer shot from the archives.)