Discovered in 1984 off the coast of Israel, the Ruins of Atlit Yam is an ancient neolithic village completely submerged underwater. Many of its structures remain preserved with several human skeletons found as well, including a mother and child. Both are said to have died from tuberculosis. The mystery surrounding the village is how it ended up underwater in the first place. Some point to a possible tsunami caused by the volcanic collapse of Mount Etna.