A catastrophic megaflood separated Britain from France hundreds of thousands of years ago, changing the course of British history. For much of our pre-history, a permanent land bridge existed between Britain and France at the Dover Strait. How and when it was removed, however, was previously unknown.

At the end of the last Ice Age the Younger Dryas Event was probably an impact in combination with another great flood from melting ice sheets. There is more than one great flood. Over here the Badlands are the remnants of a great inland flood.