Oh, and humidity in and outside the hole.

Sheesh, I'm going to have to buy a datalogger--I wonder what else the wife is going to use against me in a divorce?
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Member of the toughest, meanest, deadliest, most unrelenting -- and ablest -- form of life in this section of space, a critter that can be killed but can't be tamed. --Robert A. Heinlein