They well know about it, for a long time. One of the reasons they are called 'spooks'.

They know alot - and they apply their knowledge in very technical ways. The stuff Edward Snowden supposedly pilfered, was a controlled leak, limited hangout. We knew they have been doing this for decades. People who think his disclosures were a revelation have a lot of catching up to do.

If people could really see, into those realms, their inhabitants, machines, and the intelligence sp00ks that haunt the multiverses next door...they would lose their minds. Be careful what questions you ask and how deep you go - there are answers, but you will not like them.