Hi,
Joachim Heden the director of the film jumping in here . I stumbled across this thread here, and thought I should offer to answer any questions you may have.
Regarding the mask lights, yes, they are the standard ocean reef mask lights. The masks and how to get light into the actresses faces were one of the longest discussions/researches we did in 1,5 years of pre-production. We wanted something that was as close to reality as possible, with as little sci-fi factor as possible, that would still do the job of lighting the actresses. faces. Ocean reef was the only mask that had an off the shelf solution that worked for us. The only "mod" we did was to remove a piece of black tape on the underside of the light ramp, and replace it with film style diffusion material -- this gave us a little more light, and at the same time making that light softer.
Any other questions ?