Global VFX studio MPC (Moving Picture Company) provided cinematic visual effects for the film, including the underwater and cave environments.

A massive 5 million polygon scan of the actual cave in Thailand was captured so MPC artists could extend their practical sets. “We kept it as realistic as possible to the actual cave, including the detail of stalactites we see in the roof, and the wetness drips continuously flowing around the entire chamber,” added VFX Supervisor, Jason Billington. “Not only were we required to work on the cave environment, but we also needed to add digital humans moving around, both at the bottom of the chamber and the entrance. Adding crowds to the cave involved a combination of shooting extras on a green screen and CG crowd generation.”

Read the full article over at AUS Film.