Incorrect: There’s at least one other in the main lobby of QE.
Could have been hieroglyphics put through an enigma machine for all I knew - ty though
oh, I sit corrected. :3
UPDATE:
[code]Proxyhost@-84-9-123-164.dslgb.com//closed.proxy.accepted//?OTR,1,3,?OTR:[I—MI-G TR–SMI—ON - UN—WN S##RCE] OTR:~’// Dr///#~` B…Ami ~### ~ Not ##~ami… {interrupt}
+&&#//#// KON ,-mi C-de. Dr H–N #~~ Don__### LET HIM __ fi#d…us . {Dr Wel##}~~ [Terminal.] ~~ [Transmission Ends][/code]
This string of text led myself to believe that the konami code (look it up) was relevent in someway. I had a look on stormseekers website, and in the HTML there was a hidden konami code in there. Also posted this up on the IRC for people to ponder.
A IRC go’er named PanMieszko took it one step further and actually put it INTO stormseekers website: https://www.thestormseeker.com/
The page then gave us a redirect straight to this page:
https://terminal.blackmesasource.com/
Which as you can see, is on the same URL as BMS is normally.
The Page itself has the following message:
If you read it carefully, the out of place capital letters spell out ‘DR HORN’.
We’re being watched ladies and gentlemen. I think we’re getting close now.
You’re sitting? Impressive, I’m kinda just slouching. Like I’m melting into the chair, almost…
Oh right the ARG. Uh… anyone go through and get another look at the canteen for confirmation that it’s Code B?
EDIT: HOLY CRAP, PROGRESS.
This is all fascinating.
Some of the letters have HTML tags around them on the terminal page, namely D O R N. Not the first R or the H. Whether that means anything is anyone’s guess.
WOW! 
Finnaly, progress. It was not a troll after all. haha
BONAMI -> KONAMI. oh god
EDIT: Dr. Horn’s sloppiness is to blame for this. The pigpen message really has a B there, there is a dot missing.
So, all this seems to indicate that we are way, way over-analyzing this, when all the solutions are in fact relatively simple. In fact, I’m inclined to say that the message about cascade ciphers was just ambient whiteboard scribbles and not even relevant at all.
I’ve been thinking that for a long time now. I mean, that’s modern encryption, it doesn’t even belong to Black Mesa’s time… And there was no indication of use anywhere.
What I’m thinking is that maybe we’ll just have to put the final code into stormseeker’s website and access a hidden page.
I’ve checked the js stormseeker’s page is using, it only responds to the konami code, nothing else.
Yeah, I was expecting something of that sort. I mean, all ARG’s I’ve seen/participated had some central hub to keep people on the right track. Now we have terminal.blackmesasource.com …
I suspect we have our mysterious IRC benefactor to that for us. None of us would have found that without the obscenely obtuse messages hes been posting up on there.
I believe there is another typo in there, the message should be:
i have hidden four
codes abcd for access
to my site - dr konami
code a
one zero zero one
this way it makes sense
also, if this is true, the whiteboard with the long sequence of 5 digit numbers may be not part of the arg
Yeah. I’m thinking that it’s a hidden page on his site, and when we find and decode whatever is left, it’ll give us a link, like https://www.thestormseeker.com/hidden/.
Edit: I’ve just remembered that there was something about that tiny room behind one of those huge pipes on the ST cliffside that was bugging me. I’ll have to look at that later.
Really, Dr. Horn, be more careful when giving out crucial information, will you?
That long code could still be relevant.
And oh, god, that “KON ,-mi C-de” did catch my eye (I was thinking “KONAMI Code? Wasn’t it BONAMI? Maybe it’s a misspell, the entire message is screwed up.”). And I did know the Konami code, even though I wouldn’t try it in stormseeker’s site right away. If I only had taken that message more seriously, I wouldn’t have ignored that. Not going to make the same mistake again. 
EDIT:
LOL!
EDIT2: Actually, it probably is: TO MY SITE - DO KONAMI. Man, that part was bothering me, but I didn’t expect this.
Has anybody tried to do the Konami code on in-game?
I doubt that it would work, but there is that strange keypad in Dr. Horn’s office, and a few others that have been mentioned…
Edit: A keypad and a sequence of directions can be use as a code, if the buttons have multiple functions, like most keyboards.
Registered, lock n loaded, and ready to solve this ARG!
As far as I see from decompiled vmfs, they just seem like props…