It goes over deep snow and floats, and is said to carry in it enough fuel to make it to the North pole and back.
See more (in English) at the site of the Arctic State University.
And here is a little film showing how it floats and gets back on ice:
Kandalaksha+
The City of Kandalaksha, Murmansk oblast, and its vicinity. Getting there, where to stay, what to do. The ultimate source of Kandalaksha and area info in English.
