Drydocks

waterside basin that can be sealed and pumped dry to allow work on a vessel

PD-50 (), Soviet designation Project 7454, was a Russian large floating dry dock built at the Götaverken Arendal shipyard in Gothenburg, Sweden and commissioned in the 1980s. At the time, it was the world's largest floating dry dock and used primarily to service the ships and submarines of the Northern Fleet.

dry dock in Germany, located in Hamburg