SSX

For Deadly Descent: Ice you have to complete Mount Belukha East - Punch Up in Siberia in World Tour mode without using Ice Axes as your gear. If you have not previously completed this event then you will be racing as Alex.
The ice makes turning and stopping much harder. Boosting while turning helps a little though it's a bit hard to time and shouldn't be relied upon. There are quite a few rails and snow-covered rails that you may grind all the way to their end and will usually put you safely on the ground and usually lead to another helpful rail. I recommend starting off by grinding the first rail, following that to the next rail on the right side, which itself leads to a snow-covered rail that will take you over the crevasse and to the other side, from there if you keep to the left be warned that the terrain has a very wavy shape to it and the crevasse will cut in and out and if you go too fast you may find yourself swallowed up by it. The wingsuit is also very helpful here if you would rather use that than grinding.