Greer has a witness/source that claims he/she has been involved with a huge craft that had to be built in. Outside Seoul, South Korea.
Listen 9 minutes mark in this interview.
Ross Coulthart claims he knows where it is. Others have claimed the same, apparently.
The craft was so huge they had to carve the mountain and make a building over it. This might very well be the same craft Coulthart talks about.
I know it is Greer/TPOM stuff but he is only referring to one of his witnesses here. And some of the other witnesses he talks about here we have confirmed real already at his Disclosure 2.0 event. It is a lead at least.
EDIT: I have to correct myself. Greer only mention carve out mountain, not build in. But I would assume they have to cover it somehow :-)
UPDATE with a Google maps image of a military base with a very suspicious building??: https://www.reddit.com/r/UFOs/comments/14u5ept/update_on_the_seoul_korea_huge_craft_lead/