Detail of the Surveyor's soil mechanics surface sampler (the official name of
at the end of the arm). This was used to dig into the lunar surface,
providing information about the properties of the soil. The Apollo 12 astronauts returned
Surveyor 3's scoop so that scientists could study the effects of exposure
to the vacuum, radiation, and micrometeor bombardment of space.
Note the high-pressure helium tank (the sphere with the black band), used to
pressurize the vernier engine propellant system. Also note the green TD-339 vernier engine
near the landing leg hinge point.