The not too distant future a deadly virus has swept across Earth. Billions have perished. The survivors moved underground... 30 years on and plagued with guilt following a devestating crash, pilot Loki is coaxed back from the edge by his partner Sash. Together they must take on a new mission; go Topside. Retreive missing recon team. Hostility unknown. After a thunderous journey through the Earth's crust they discover the planet surface is not what it once was; only death survives. As they quickly uncover the fate that befell the first team, they are forced to make a choice; stay and die or stay and fight. But what will kill them first....the mutants or the virus?