If you didn't notice this one earlier, a s survey of the wrecks lying in Scapa Flow has been published.
This can be found online here:Scapa Flow Wreck Survey | Wessex Archaeology
The found a German submarine, and a trawler used to operate boom defences at the entrance to Scapa Flow.
It's hoped that the survey findings will help Historic Scotland to consider the case for a Historic Marine Protected Area.
Read a little more about it here:Scapa Flow's historic wrecks mapped in sub-sea survey