Found it: Sinking Atlantis (full episode to watch)
The PBS show was about Thera ( Santorini) blowing up. A huge, known event that would have been recorded in written history at the time and should have had some mention of it survive even after 3000+ years. We do have some written history from that time and it was certainly the most impressive event of their time.
New Ice-Core Evidence Challenges the 1620s age for the Santorini (Minoan) Eruption
Journal of Archaeological Science, Volume 25, Issue 3, March 1998, Pages 279-289 | 13 July 1997 | Gregory A. Zielinski, Mark S. Germani
Posted on 07/29/2004 12:25:45 AM PDT by SunkenCiv
http://www.freerepublic.com/focus/f-chat/1180724/posts