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This is a video showing how Mountain Man Mike built his Underground Bunker / Underground Shelter.
He dug it out from 1995 to 1997 by hand with no mechanized equipment to help him. This was at 10,000 feet elevation with short summer seasons. The most expensive consideration was buying concrete (about 100 (EDIT 250!) bags of 80 lb concrete) to the total of $1000 - $1500
Unfortunately there are no pictures of the 1995-97 digging as this was before digital cameras and MMM was on his own with no-one to take pictures. (I don't think he began taking pictures until 1999).
The digging parts of the video are of the Cabin site nearby inter-shown with the bunker itself. The design and plans are of a small pole shelter triple-clad with roof logs and sheeting (waterproof).
This allows the weight of concrete and earth on top for the overhead. For the walls logs and steel 'H' Beams along with more sheeting (waterproof) then earth.
The internal space resembles an 'L' shape as recommended for fallout / blast shelters. This is small but incredibly strong and resistant to cave-ins, earthquakes, disasters. The shelter is multifunctional with two bunks and two stoves providing heat.
A main entrance with a steel blast door and an emergency exit / trapdoor are installed.
The year round temperature is about 35 - 45 degrees without being heated. The bunker has been featured on multiple social-sites and Mike is often contacted by television companies for it to be shown on mainstream broadcasts. The Colony short-listed him for appearing on the show but ultimately another was chosen.
However when the challenging conditions are revealed to TV companies (short accessible seasons, snow fall requiring snow-mobiles etc) the producers normally go for an easy access bunker elsewhere and underground shelters that are more fancy.
This is doable by any able-bodied male (or female if driven enough) with the right location.
The location inspired a fictional film which was shot at Mike's Bunker called After The Fall / Raiders of the Mountain Hold:
Music used with permission and Royalty Free Licensing:
MW Score - 16 - Up Or Down
MW Score - 18 - On My Return
Beyond the Stars by Machinimasound
Rallying the Defense by Machinimasound