In 1940, scientists reported that Arctic sea ice had lost 40% of its thickness, down to 218 cm.
Papers Past — Auckland Star — 14 December 1940 — WARMER ARCTIC
That is about the same thickness as the Arctic currently averages.
Disrupting the Borg is expensive and time consuming!
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Real Science 
If the climate kooks stay with the Academik, they could chart the ice thickness as the snow piles on top of them. Apparently, they’re too busy partying.