The Sunken City

At the bottom of a prehistoric lake in Antarctica there is a city old as time, a relic of an alien pre-human intelligence. Somewhere, deep in its ancient labyrinthine depths, there is an ever-increasing source of power of incalculable menace.
Now an elite team of Navy divers is going down to investigate it, and what they find is a nightmare beyond imagining.
The city is not dead.
As it wakes from its deathless slumber of countless millions of years, so does the race that built it, unleashing a...