The trailer is equipped with computers, chairs, video cameras, generators, lasers, nuts and bolts, and two items that turn out to be crucial: garbage bags and toilet paper. What's missing is one female coupler. Robotics Institute research engineer James P. Teza performs some last-minute surgery, soldering two cables together, and Groundhog drives down the ramp out of the trailer, approaching the mouth of the mine. Remaining inside the trailer are the computers that will display the maps and images Groundhog sends back from its journey, the same visuals that will be exhibited at the conference in Charleston before and during Whittaker's talk. Using the laser-generated maps as his guide, Baker steers the robot using the computer's arrow keys to turn right or left and the home key to go straight ahead.