I was fortunate enough to take the trip of a lifetime to BC! Excuse my powder skiing because I'm from Wisconsin. I now see that the skiing in all-mountain and powder edits is much harder than it appears on video. Enjoy!
I think it was from a hot spring (not sure if that is the right term considering it's warm air flowing out of there instead of water). Anyways, it was deep enough and dark enough that you couldn't see the bottom, I'd guess maybe like 15 feet down.