Underwater Expedition Delivers Key Findings In Search For Evidence Of Early Americans. First raises the question, what kind of years? Archeologists tend to talk in carbon dating years, which requires quite a correction to convert to calendar dates: 13,000 carbon dated years (13 ka BP) is 15,300 calendar years (15.3 ka Cal BP). One could also wonder about that 130 feet of water as sea level rise, if that was to be due to melting ice sheets it would be the equivalent of some 5 to 6 Greenland ice sheets, but most of the melting started well before that, maybe something like around 17,500 Calendar years ago and obviously you don't need more than a meter or two to make that area uninhabitable. So what is it?