Captain's log - Stardate 2261.484
Another mystery with our treasure planet. The nuggets of metals that Spock had the geology team gather are like those smooth tunnel walls - no known way for them to have occurred naturally, but there they are. Pure nuggets of metal with no impurities.
If there isn't any intelligent life currently here, there must have been in the past. Time to do more in-depth exploration. The surface is inhospitable, so if this planet had or has any natives, they would have to have been living underground. Possibly deeper underground than our scans reach.
