And here's what I think they look like:
Note that Styrofoam snow is an old standby in Xmas tree decorating.
Update: Here's the vid. Look at the way the "snow" inside the "ark" behaves when the guy runs his hand through it just short of the two minute mark.
PPS. Can't see anyone's breath in the video either, even though they're on the cold slopes of Ararat. That's also how you can tell how the winter scenes were shot on an indoor set in old movies.