This is gorgeous! You should be very proud of your work. It's really lovely!
I have a few questions:
Correct me if I am wrong -- you don't use Magic Filters -- you rely only on manual white balance.
Which "picture profile" did you use on the LX100 underwater? Did you change the Noise Reduction, Contrast, Sharpening or other settings? (I have been playing with those on land, but still haven't decided what works)
Did you use one of those contrast curves (shadows/highlights)?
When you edit - do you edit the video in 4k and then export it to 2k or HD, OR, do you edit the video on an HD or a 2K timeline? (I'm trying to figure out which one works better, still haven't decided).
Forgive me for peppering you with so many questions -- I was away over July 4, and while I was gone, my Nauticam housing came for my LX100. I am so excited -- I haven't even had the chance to open up the box yet (I'll do that tonight), but I am trying to get ready for my big dive trip to the Red Sea (Egypt) at the end of the month!