Astronaut David Scott, commander of the Apollo 15 mission, picks up a cordless drill to take samples on the surface of the Moon on August 1, 1971. Mt. Hadley is seen rising in the right background. Scott uses a battery-powered drill during the Apollo 15 mission. The drill was used to create a hole 2.4 meters deep in the lunar surface. A probe was planted in this hole to measure heat flowing from the Moon's interior. The small box in the foreground is a solar wind spectrometer, also part of the Apollo Lunar Surface Experiment Package (ALSEP). During their 67-hour stay on the Moon, they made three excursions totaling 18 hours 35 minutes. This included the first use of the Lunar Roving Vehicle (LRV).