"Beagle 2" was also equipped with a small sample retrieval tool named Planetary Undersurface Tool or PLUTO (nicknamed the mole), that would have been deployed by the robotic arm. PLUTO has a compressed spring mechanism designed to enable it to move across the surface at a rate of 20 mm per second and to burrow into the ground, collecting a subsurface sample in a cavity in its tip. PLUTO is attached to the lander by a 3 m power cable which could be used as a winch to bring the sample back to the lander. It had the capability to burrow to depths down to 1.5 m.