The drill was the most intriguing thing in the film to me, as it suggests that there is (or was), another space-faring race out there as advanced as Predators or Humans, (or Space Jockeys, if you consider Alien and Predator to share the same fictional universe still, which I do).
Of course, being that the film didn't get anything quite right, this was a throw-away line and nothing more. It would have been interesting if the jungle planet had been in contention between not only two types of Preds, but another alien race as well...but I guess not.