The year is 2080, and drastic climate changes has altered the world as it once was. Healing after a personal tragedy, marine biologist Sam McKay relocates from Miami to the waters near a small Danish island, where a domed underwater city has been constructed. To begin with, Sam enjoys the simple existence and menial work as a window cleaner, but then he comes across not only a dark plot, but also an ancient myth that might not be fantasy after all...