Earth’s most recent ice age began 115,000 years ago. In it’s peak, 7.7 million more square miles were above water than are today. Many believe humans had architectural skills longer than previously thought—far before agriculture. Could these submerged hunter-gatherer hotspots host a lost civilization? Plato marked the first historical account of a powerful utopian civilization lost to the sea 9,000 years before his own time. Here we are 2,300 years later still wondering. Is Atlantis sleeping below sediment in the Dutch area of today’s North Sea? Or buried by time northwest of the Australian continent?