21 metres deep, 6 miles?

We have to commit to metric, every inch of the way.

Anyway, from Wikipedia:

"During the most recent ice age (at its maximum about 20,000 years ago) the world's sea level was about 130 m lower than today, due to the large amount of sea water that had evaporated and been deposited as snow and ice, mostly in the Laurentide Ice Sheet. Most of this had melted by about 10,000 years ago."

Has this been under dispute?