Check out this overland technology.

[Colorado David]

http://forum.treasurenet.com/index.php/topic,213971.0/topicseen.html

[Metcalf]

Russia also developed something like that. There was also an expedition to cross the bering strait that used a snow cat modified with hydraulic screws to help float and climb out of the water.

[007]

This is it:

http://www.icechallenger.com/