Just back from a fascinating week up in Scapa Flow as part of the Scapa 100 celebrations to mark the 100th anniversary of the scuttling of the Imperial German Navy High Seas Fleet there on 21 June 1919. As well as getting a ton of world class diving done, I gave an evening talk highlighting the absolute dearth of information about diving the sunken German warships when I first visited Orkney in 1982. This led on to my idea to write Dive Scapa Flow, first published in 1990, which gave serious diver information for the first time. Now in its 5th, 100th anniversary edition, 19 years later it has evolved along with our diving techniques such that although it still retains the title, it is a very different book.