Peter Zuccarini is listed as “underwater director of photography” in the press kit. On his imdb page, we can find a Dior commerical with Romain Garvas’ name attached to it.
This information, although unconfirmed, came directly from an official Cannes Press kit for the movie ‘All is Lost’.
Apparently, Rob mentioned his appreciation for Zuccarini’s work in an MTV First Interview here:
Thanks to Laura and RPLife for the research!