In deep snow it is indeed possible to get stuck. Snowmobiles depend on speed and 'floatation' in deep powdery snow, and riding in it actually feels like a watercraft. Machines rigged for those conditions have 'paddle tracks' which engage the powder more fully. The average snow depth might be three feet, but in ditches, depressions, grassey boglands, or along side a trail, it can be much deeper. If you go off trail and stop or tip over in deep snow, it can be very difficult to get going again. Something I have done in a similar situation was to stomp down a circle around the sled and drag the machine around and ride out on the track I made coming in. Not easy, as snowmobiles weigh 500 pounds and you're in waist-deep snow....Luckily, I had help.