Dehumidifing without electricity

Friends of mine have have a walk out root cellar\storm shelter\basement...

They call it a root cellar, but it's dry and they use it for their home canned goods so that's not technically correct.

They run a dehumidifier.

I want one, but I cannot justify the $10k As in a few years I plan on building a ICF home (also at least partially surrounded on 3 sides)

But I was thinking: short of installing a small woodstove

How could you keep the moisture from getting too bad?
Ventilation will help, but what else?

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Dehumidifing without electricity