Interactive map tracks sea levels and ice cover last 135,000 years via Marine Isotope Stages. Odd MIS numbers mark warm interglacials. Even MIS numbers mark cold glacials. 135,000 years ago end of MIS 6: seas -124 meters below today. Last Glacial Maximum 24,000 years ago: seas -130 meters from water locked in ice. North America, Europe, Asia buried under vast ice sheets at LGM. Holocene warming is MIS 1. Sea levels stable last 6-7 thousand years. Continental shelves total 27 million km² submerged now.