I put all 3 on top quickly. that seemed to work.

Another puzzle problem with #10. I have level 3 of both engineering and exploration and I drug a villager to the ancient floor but they won't uncover it. I put 3 esteemed elders there that are Masters in Farming, Building and Research and they wouldn't do it either. Still says 'needs more research'. Even drug an adept builder over there with them and another Master Scientist. Any ideas?