well since Q linked to DIA, I just tried reading through comments about it's construction. This is just food for thought since Q repeatedly stated "that there are no coincidences"

There were also a few other comments/anecdotes about vast amounts of dirt being dumped. One in user named "Kate something" can't remember which vid it was from (about DIA conspiracy), comment was posted 2 years ago. She had an interesting comment thread about this same thing. (if anyone comes across it please link me)

I also linked to a pdf explaining the in depth construction of the roof for anyone who is interested,