March 2006
Underground Wi-Fi
Cities may wait, but mines are getting full wireless broadband coverage.
By Patric Hadenius
For most of us, it's remarkable enough to access the Internet from a plane 10,000 meters in the air. But when Swedish process-control engineer Ulf Olsson does that -- as he did recently while flying over Arizona -- he's also monitoring an iron-ore drill 1,000 meters below the earth's surface in northern Sweden, thanks to underground Wi-Fi.
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Massachusetts Institute of Technology