Atlantis Rising: The Mission

After 500 years under the waves, man is returning to the surface. The world didn't end in a blaze of nuclear weapons or terrorists weapons of mass destruction. Instead it had been destroyed by mother nature herself through an unending series of volcanic eruptions, earthquakes and tsunamis, as well as category 6 storms and acid rains. But mankind had survived, retreating below the waves to undersea cities.
But as the power source for the domes, a geo-thermal vent is in danger of collapsing which will force them back to the surface. And while civil unrest rises in the domes, the mission to the surface discovers that they are not the only survivors...