On October 13, 2010, a group of 33 Chilean miners was rescued after being trapped approximately 2,000 feet underground for 69 days, marking the end of the longest-ever mining rescue operation. Their successful rescue was not secured through the brute force of mining equipment alone. Zephyr Technology's BioHarness™ BT, a device that allowed rescuers to monitor the health of the stranded miners, fed information to Panasonic Toughbook® U1 and CF-29 computers. The Toughbook computers were selected based on their ability to withstand the demanding environment found in the mine and on the surface at the command center.