Scout

...After 16 years of continuous jumping and warp maneuvers, the jumper made it to his destination, and then the oddities began. First, the computer woke up the intelligence officer a year later than the system ordered. Secondly, this star, to which they flew, was a white dwarf, was destroyed by an explosion, or burned out. Everything, except for one and only planet, which seems artificially close to the luminary in order to be in the "habitable zone". Third, the radio signal was lost.
The scout was forced to land on the planet in order to replenish water supplies and repair the ship's systems. Examining the area, he found strange summers that did not show hostility, and tried to get his attention. Following them, the scout found a grotto that goes into the rock. It took several days to explore the cave, but the result was a huge underground cavity filled with giant machines of alien origin ...