Phobos 2, Soviet probe to Mars, launched 1988

Phobos 2, launched July 12, 1988, was the second of Soviet probes sent to explore Mars and its moons, Phobos and Deimos. The first probe, launched just days before, was lost not long after launch, but Phobos 2 made it to the Red Planet.  It investigated the Martian atmosphere and took 37 pictures of the moon Phobos, but contact was lost on March 27, right before it was to pass within 50m of the moon's surface and release two landers.  The Soviets determined the problem was due to a failure of the on-board computer.

Here is the only video I could find of the Phobos 2 program that did NOT include any references to aliens, alien ships, or abandoned alien civilizations.