Winter caving needs to be quite selectively undertaken by those who might consider it as certain caves are used as hibernaculums by the province’s bats. Disturbing a bat from its winter sleep could kill it. The water passages in Marmora have in my experience been free of any bats. I suspect there is to much air movement and also the rushing water can vary quite drasticallly in height. Bats could be scoured from their roosts in a heavy spring thaw.
In the photo I am dressed in my winter caving outfit. Warmth is essential and though wool precludes the explorer from tight jagged squeezes, of which there are many in Marmora, it maintains its warmth, even when wet. As for the legs, neoprene is fine, but I must admit, stripping off in the snow, my feet felt like they were on fire, it was very painful.
Here I am following in along a channel in the ice. This is a section of passage where the water leaves the surface and disappears for a short time under a landscape of juniper and cedar. Numerous side passages lead off to other passages and who knows where. I had wanted to see how the tunnel felt during winter high-flow. The situation soon improved and the water became quite shallow. It is an environment of sparkling ice formations – very beautiful but sadly melting with the warmer weather.