i think its attached to luna 13 via a cable....

"When the penetrometer was activated, the rod went 45 centimetres into the Moon and revealed that the surface layer was made up of a soil-like medium with a density around 1.0 grammes per cubic centimetre. The second boom carried instruments to measure mechanical and physical properties, and the cosmic-ray reflectivity of the Moon's surface.

The granular nature of the soil can be seen in the panoramic photograph below. Also to be seen are shadows of both of Luna 13's pair of panoramic camera imaging devices and its rod-shaped radio aerials."