This is an interesting site that discusses subterranean bases all over the world. For some there is no description, just the location is provided. For others it discusses anomalies and strange occurrences in these places. Some of these places may be worth digging into.

There is also links to something called the Branton Papers (which seems to be related to alien abductions), The Superman Project (a brief glance included reference to military bases and Silva Mind Control) and The Dulce Papers (related to happenins in Dulce NM)

Some of the entries for Canada's Underground.

Kanata, just west of Ottawa, Canada is reportedly the location of an alien projects test center. Huge facilities for U.S. and Canadian military corps, the research center provides projects and storage for Area-51 or Dreamland. This site is also involved in an ongoing battle with an alien collective that has succeeded in infiltrating much of the governmental/military complex via sell-out by Industrialist, Fraternal and Intelligence agencies.

The Nahanni Valley Canada - This covers 250 square miles in the southern end of the Mackenzie Mountains of Canada. It lies almost 550 miles due west of Fort Simpson on the Mackenzie River of northwest Canada. Hot springs and sulfur geysers keep the valley warmer than the surrounding areas by about 30 degrees year -round (the valley is above 60 degrees latitude), making it perpetually mist-covered. This valley is inhabited only by animals as people entering the valley are usually found headless and quite dead. The Indian tribes of the area avoid this valley. (These tribes include the Ojibways, the Slave, the Dogribs, the Stoney, the Beavers and the Chipweyans.) This valley is often referred to as “the Valley of the Headless Men. (I read a while back that Pierre Trudeau visited this area)

http://www.subterraneanbases.com/canadas-underground/