Jeff and I believe that this small group of shelter-like caves near Guelph, Ontario, Canada might well be the resurging exits to a system that slopes downward from the river valley along the bedding plane. It appears that from the visit that we made, the tunnels all slope downward and are soon filled with clay and gravel.
It appears that since our visit the previous weekend, the ice crawl into the #8 cave has got significantly tighter. The February thaw and then flash-freeze has almost closed some passages in places. I vaguely entertained the thought of the tunnel freezing shut behind me. That would be a nasty way to die, especially considering that lying on the ice, with my coat pulled up from my stomach I was getting a taste of how it would feel to be slowly freezing.
Anyway, we did find a spot with blowing air on our previous visit and we also saw 2 likely spots where digging might open further passage. I am reminded of the dig and railway system that I had once seen in the Cheddar Cave. Eventually those cavers reached the river Axe and from there some incredible stories of underground and underwater exploration.