capa Flow is the UK best known scuba diving site. It is now a protected site, therefore stopping any more salvage work. On November 23rd 1918, the German High Seas Fleet under guard of the British Fleet entered Scapa Flow. In total 74 German ships, comprising of 11 battleships, 5 battle cruises and 8 light cruisers plus 50 destroyers / torpedo boats were to find the last resting place in Scapa Flow.
In the book, The Grand Scuttle, by Dan van der Vat, gives a detailed account of the torment and challenges Admiral Ludwig von Reuter faced. Effectively, he was always three or four days behind of any news, which meant he had to try to "speculate" of what will happen in London, Paris and Berlin. On the 21st June 1919, von Reuter issued the command for the rigged ships to be scuttled.
Even though, the British knew of his intention, they could not stop it. Possible, they didn't even want to. The scuttle ensured the British maintained the control of the high seas with their navy and didn't have to share the German fleet with the other victorious powers (France, Russia, Belgium) and they didn't need to upgrade their navy either - the German fleet was technically more advanced. In addition, it is ironic, a lot of the salvaged steel from the German Fleet was used to build part of the British World War II fleet (the steel was considered of better quality).
There are a number of fantastic dive books available, the two to recommend are:
Scapa Flow Dive Guide by Lawson Wood and Dive Scapa Flow by Rod Macdonald
Scapa Flow Dive Operators