I should really include something maritime related rather than just a nice view out of the window of the Archives Centre so I shall mention a few points from the entry on 'ice' in the very useful Oxford Companion to Ships and the Sea, part of our library collections. Sea water freezes at about -1.9 degrees centigrade rather than the normal 0 degrees because of the dissolved salts in the water. When sea water freezes the salts are left in solution making the unfrozen water saltier. Frozen sea water forms pack ice which can last for 5 years in the Arctic, whereas icebergs are broken off from glaciers or ice shelves, so we're unlikely to see one of those in the dock.
Lead image: Canning Half Tide Dock