Whoa. That's impressive. I'd like to see the snow blower they used to cut those (incredibly neat-looking) tunnels through the snow. It doesn't look like a plow was used, to me.

I doubt, however, that the depth is really 100 feet (30.5 meters). A regular car is what, 5 feet? Then it looks like maybe four or five cars tops, which would mean about 20-25 feet (around 6-7 meters).