Ancient Discoveries - Mega Structures Of The Deep

Our modern day landscapes are littered with the remains of amazing ancient superstructures. But new, cutting edge archaeology is beginning to reveal that this century's most exciting discoveries will lie at the bottom of the ocean, where entire submerged cities and extraordinary structures are now beginning to be found. In this documentary of History channel, researchers using the latest tools of marine archaeology and sub-radar sensing technology,  explore these enigmatic hidden superstructures of the deep.