They shot most of the film on a stage, with the underwater work done in a tank, as it was impractical for them to attempt shooting an ambitious 3D production on locations where control is limited. The team had visited the set of Avatar and were aware of some of the challenges inherent in working with 3D, and as such, they built their sets specifically to work around said challenges.
Take a look at the trailer below, and note the final moments, as Josh seeks even the smallest air pockets as he clings to life this was the most effective scene that we were able to see.Īs to the physical production, Sanctum, literally, used the same cameras that were utilized on Avatar, so they were working with 2007 technology.
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