The Titan Project, an international research station off the coast of Australia, discovers a thriving zone of life in an otherwise dead sea. The area teems with a strange bioluminescent coral that defies science yet holds great promise for the future. But the loss of a military submarine in the area triggers a brutal attack and sets in motion a geological disaster that destabilizes an entire region. Massive quakes, volcanic eruptions and deadly tsunamis herald a greater cataclysm to come --- for something is stirring miles under the ocean, a threat hidden for millennia. As seas turn toxic and coastlines burn, can Sigma Force stop what has been let loose --- especially as an old adversary returns, hunting them and thwarting their every move?