Earth's deep, uncharted waters have long been a source of wonder and speculation about what lies beneath. From the submerged ruins of Dwarka and Japan's Yonaguni Monument to the strange "road" discovered near the Bermuda Triangle, ancient underwater structures hint at civilizations lost to time. From legends of aquatic cities ruled by gods and creatures like Loch Ness and the Kraken to frequent UFO sightings, might these point to an otherworldly presence lurking in Earth watery depths?