These people were located after the FINDER gear found their heartbeats.
Originally developed by NASA, FINDER stands for Finding Individuals for Disaster and Emergency Response.
FINDER is a microwave-radar technology to assist in the finding of extra-terrestrial life on planets outside the solar system.
FINDER can even distinguish between animal and human heartbeats.
FINDER is only a prototype at the moment.
source: www.techworm.net
