Wen is a tour guide for a state of the art underwater park until she’s recruited to help a small team explore a strange tunnel under a oceanic trench. One that leads deep under the surface, not far from the Earth’s core. But what they find at the end of the tunnel defies everything they’ve ever known. A lost world. A place of beauty…and ravenous teeth. What was supposed to be a simple in and out mission is soon filled with conspiracy and the ultimate fight for survival against the vicious predators stalking them. With their way back home blocked, all bets are off.