Sometime later, present day, a new team, led by Dr. Nicolai, with his associate Dr. Kathryn Jennings and cameraman Alex Kim explores the site, and the mythology behind the winged demons depicted in the mosaic on the abbey's floor. Local biologists believe the cave could contain an undiscovered ecosystem, so they hire a group of American spelunkers led by brothers Jack and Tyler McAllister – thrill-seeking professional cave explorers who run a world-famous team of divers. They arrive in Romania with a modified rebreather allowing a diver to remain submerged for up to 24 hours. The diving team includes rock-climbing professional Charlie, first scout Briggs, sonar expert Strode, and survival expert Top Buchanan.
