Hi

I've got a geological fault in my cellar. It goes a fair distance to
either side, and as I have just discovered, a fair way down. Now that
the strange cold wind has ceased emanating from the crevasse in the
floor (I'm exaggerating it's only a ~4" wide, but seemingly endless),
I was wondering if it might be worth keeping open as a curiosity and a
Radon sump?

T