[blam]

"AFAIK, there isn't any supporting evidence anywhere for it. "

There is ash and pumice in Egypt tied to Thera and dated 1628BC+- and a tsunami on Crete dated to 1645BC+-.

Sometimes the ice layers are compressed, melt together or completly missing. I think they are a very good indicator but not 'fool-proof.' We'll have more data within the next five years or so...

[SunkenCiv]

"There is ash and pumice in Egypt tied to Thera and dated 1628BC+- and a tsunami on Crete dated to 1645BC+-."

There are deposits believed to be from Thera. The 1628 BC date is based on the ice core evidence, and that doesn't exist any longer. Depending on the depth (and remember, these deposits are not found in contexts by which they can be dated through ruins), they could be from 200 BC, or they could be from 22,000 BC.

There was never a tsunami on Crete in historical times. There's no geological trace of it. The very towns -- contemporary with the supposed supereruption -- which face Santorini show no signs of being overwhelmed by a tsunami. Some of them were burned, but that's consistent with sacking by human hordes. That's a situation to be expected, since inland towns in Crete and on the Greek mainland show the same signs.