Lunar landing dress rehearsal. LM Snoopy descended to 14 km, closest approach without landing.
Trajectory
Courtesy of NASA (Public Domain)
Full Apollo lunar-landing profile, translunar injection, lunar orbit insertion, LM separation, descent, minus the actual landing. The LM Snoopy descended to 14.4 km above the surface and tested every system needed for Apollo 11, including a brief uncontrolled tumble during ascent-stage staging that the crew recovered from with seconds to spare.