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Gps-Free Tech Can Track Miners' and Soldiers' Boots ­nderground

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Micro-Inertial Navigation Technology

Conceptual view of the Micro-Inertial Navigation Technology system.

Credit: Carnegie Mellon National Robotics Engineering Center

A mining crew is trapped deep underground after a cave-in. Firefighters run into a smoke-spewing high-rise to battle a violent blaze. A team of soldiers breaches a door and storms into a dark building.

From Scientific American
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