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Elon Musk's Tunnels and The Boring Company
Category: /Ideas/
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Elon Musk now has a tunnel company. https://www.boringcompany.com/ 
Believe it or not, a 60 ft diameter tunnel can be dug: https://en.wikipedia.org/wiki/Alaskan_Way_Viaduct_replacement_tunnel
Here is how to determine how many square feet of livable space can fit in such a tunnel.
1) Calculate the square that can fit in the tunnel using http://www.easysurf.cc/circle.htm#sqincil
2) Determine the number of floors possible (4)
3) multiply the length by the floors by the width (=5280*4*41 = 865920 square feet)
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