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That looks incredible and I'm sure the cold must be very cold.

It's not that cold yet, but it wouldn't be wise to let that dampness inside. This is the condensation on the OUTSIDE of the greenhouse..

Great, I hope you can enjoy it all.

Looks like the beginning of a good horror film. LOL

Yes, I was thinking about it - why a fast-moving fog is such a recognizable trope for immediate danger.. best I could come up with is Propane.. as in something like this -

Then have some Zombies come out of there. LOL