HOW LONG I HAVE WAITED FOR THIS. FOUR YEARS, I HAVE WAITED FOR THIS.
In fact, in 2013 I prompted, "'Impenetrable is just another way to say 'inescapable,'" which a_starfish masterfully ran with to create this fantastically atmospheric, creepy comic, if you haven't seen it. Or even if you have, but not since 2013. It's a great thing to tide you over until 12x22/23 tonight!
Here is a preview panel:
I also love that scene at the end of 12x19 that juxtaposes Sam and Dean's home-making with the BMoL's infiltration/denial of that sentiment even more than I did previously. Especially since the only reason Sam and Dean probably weren't as guarded about the BMoL's unlimited access to the Bunker as they should have been is because they were functioning under this perception that it was theirs--something that even a lifetime of suspicion/paranoia absolutely could not shake.