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Re: Unbelievable drydock
This dryock works differently from what one is usually used to. The whole area is surrounded by a wall. In front of the cruiser it is an earth wall. On the north, south and east sides it is a concrete wall. The entrance to the harbour can be blocked off by a caisson. The large doors of the building halls can be shut off by large (sliding?) gates. After everything is shut off, water will be pumped into the area until the cruiser floats free. Water level inside the area is then above the water level of the harbour. The cruiser is then tugged to the deeper area of the bassin (the part you see flooded in your picture). The water is then pumped out of the area again until it is at the same level as the harbour. After removing the caisson from the entrance the cruiser can be tugged out of the bassin.
I think one advantage of this type of drydock over a graving dock is the smaller amount of earthworks necessary during construction. Especially if you want a drydock for very large ships. And you don't need to work below sea level and don't need to seal the drydock's caisson at all times a ship is docked inside. That may be an advantage in that kind of climate with much ice in winter.
The smaller drydock to the northeast works the same way. In the current Google Maps satelite view you can see a 'Delta IV' class SSBN sitting on one side of that dock. The other side of that dock hat rails that allows a submarine to be put on rails to be moved into one of the large halls there.
This doesn't seem to be a drydock - the ship was in work above the ground - on rails? Apparently she was to be refloated in August, so they must have had rails built leading to the basin to the north.
(Even though Jon's image link doesn't work directly, I was able to see it with Firefox View Image and also by going to Severodvinsk in Google Maps. And that view is not realtime.) A google search shows several photos of the ship father along in reconstruction than Jon's Imgur image.
I've seen some wild drydocking before, but this is way too far inland for a ship of this size. It's the Russian Battlecruiser Admiral Nakhimov in Sevmash being refitted and modernized. I can't understand how they'll refloat it without destroying everything to the north of the ship.
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