innocent_white_lamb writes "The Canadian military is currently testing a $620,000 hybrid-electric stealth snowmobile. Testing includes speed, towing capacity, endurance, mobility, usability, and of course, noise emissions. The testing and most other information about the stealth snowmobile is secret and very little information has been released other than the fact that it does exist. One document reads 'The noise level of an internal combustion engine cannot be reduced to an acceptable level for missions where covertness may be required, especially given the increased propagation of sound in cold, dry, Arctic air.' Therefore, National Defence's research agency is 'pursuing the development of a "silent" snowmobile for winter operations in Canada, specifically in the Arctic.' Michael Byers, an Arctic policy expert, questions the need for a stealth snowmobile. 'I don't see a whole lot of evidence that criminals and terrorists are scooting around Canada's North on snowmobiles and that we have to sneak up on them,' he said."