Underwater test footage shot on Panasonic GH4 4k UHD.
Original and after grade footage (4K UHD down-sampled to 1080p).
Cine-D (contrast -5, sharpness -5) and other setting were default.
Crushed black, lifted red & blue channel each clip differently in post.
Panasonic GH4, 7-14mm in Nauticam 180mm dome & housing.