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I'm not surprised, I just didn't have any first hand knowledge of it prior to seeing it in the movie.
Designed and recently patented by National Geographic explorer Michael Lombardi and Winslow Burleson, an associate professor at New York University, the inflatable Ocean Space Habitat is a portable life-support system for divers who want to go deeper and stay longer than conventional SCUBA allows.
These guys were allowed to patent something that someone else invented 40 or more years ago and has even been seen in movies released six years prior to the patent application.
They use such a device in the movie Sanctum, and I don't think it was invented it for that particular dive.