Ikelite - using the 10-17mm port on the 8 inch dome where you cant see the clips, far as I can tell one of the clips popped while rotating the port. Port design since changed. Lost camera, lens survived.
Small leak on Nauticam at zoom knob. Turned out no loctite being used on early versions, apparently is now. No camera or lens loss. Retested and didnt leak, but zoom failed to work for 17-70mm entire trip as a result, because it was out of alignment and I blamed my lens being too stiff instead of realising the real culprit. Again, since changed apparently. I was very very lucky it didnt unwind entirely, as I hadnt really figured out what was causing the problem and assumed it was just a grain of sand or the like.
I have the Leak Sentinel earlier version but unfortunately it also sticks out too far to use with my tokina and 8 inch dome, which is an ikelite/nauticam combo and rather unusual so hardly foreseeable, just bad luck. So it means it ends up too much swapping around is needed, which increases room for mistakes with someone like me. Ill update when I next plan to do a trip as apparently its since been shortened - I mostly do macro now, so its not a big issue.
The obvious lesson here seems to be dont buy version 1!