But is the plan really feasible?
They're no bigger than a microwave oven, and can see through weather and darkness.
Elon Musk isn't the only one venturing below Earth's surface.
The "service stations in orbit" will increase the lifespan of current satellites.
DARPA is funding two projects that seek to use brain implants to treat mental illness.
The plants of tomorrow may be "organic surveillance sensors."
Self-driving helicopters are here.
"The capability of consuming power only when useful information is present will result in nearly unlimited duration of operation."
From a spaceplane to the BRAIN initiative, take a look at the most ambitious projects from the agency.
DARPA wants to boost the brain's ability to see the world.
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