Underwater Ruins of Civilization

The level of Earth's Oceans have changed many times over the millennia. Global sea level rose by a total of more than 120 meters (360 feet) as the vast ice sheets of the last Ice Age melted back. This melt-back lasted from about 19,000 to about 6,000 years ago, meaning that the average rate of sea-level rise was roughly 1 meter per century. Since many early cities and civilizations were built near the coast, there must be many submerged ruins around the world we are not yet familiar with. T...