It’s noon in Ocotillo Wells, California. A vast and empty patch of desert between San Diego and the Salton Sea, this part of California might as well be Mars. After just a few minutes, everything is covered with a fine white dust, soft to the touch, like powdered sugar. Kris Zacny, the vice president and director of exploration technology at Honeybee Robotics, grabs his hardhat and vest out of his car and walks over to a U-Haul that is serving as mission control. Today, Zacny and his team will begin testing the Planetary Deep Drill, designed to penetrate miles under the surface of places like Mars and Europa to search for one thing: evidence of life.