Well I've put in a vent axia type fan in one of the windows, and opened all the others a little as well. Also opened the boiler doors so there should be a healthy updraft through the chimney. Trouble is, it's about 80%rhd outside just now, so have to wait for the thundery weather to subside a little. Only about 2/3rds of the cellar is actually underground, so there are short windows around the outside.
I also have an 'earth cellar' in the garden, that's a hole in the ground with walls of solid stone, and earth heaped on top. They were used to store potatoes many years ago. It has a chimny typre vent, and last year I cocked the door open a little to let air through. But the outside air seemed to bring in so much moisture that the walls and floors were dripping wet. In the winter it stays dry.
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Ventilating cellar 
Ventilating cellar 