That there are a lot of undiscovered sites just off our coasts is a well understood fact in Archaeology. For most of history a very high percentage of people l

That there are a lot of undiscovered sites just off our coasts is a well understood fact in Archaeology. For most of history a very high percentage of people lived on the coast. We know that ocean levels are higher now than they were several thousand years ago. That necessarily means a lot of sites are under water. So why aren't there more underwater archaeological digs? Underwater sites are harder to find and they're hideously expensive to dig up. Archaeology is, traditionally, not that well funded. If, for whatever reason, the Earth were plunged into an ice age (and our civilization didn't collapse), there would be a golden age of archaeology as thousands of sites are discovered and studied.