The subscript cipher showed up in the 11B-X-1371 video around 1:51:14 on frame 2791. It consisted of several Letters some of which were followed by a number ranging from 0 to 4. It decoded to:
- SOON COMES THE FALL OF ANOTHER GREAT EMPIRE THE FALL OF THE EAGLE IS ON THE HORIZON. JOIN US. THE EAGLE IS INFECTED WILL SPREADD HIS DISEEASE. WE AARE TTHE ANTIVIRUS WILL PROTECT THHE WORLD BODY.
The letters that are doubled up in the decoded text spell out DEATH.
The cipher is a simple substitution cipher and the key to solving it is the word: ANTIDISESTABLISHMENTARIANISM. Each letter in that word corresponds to a letter of the alphabet but because you have multiple instances of the same letter they are also followed with a subscript number for example I4 refers to the last instance of I in our keyword and the letter Z in our plain text and I0 refers to the first instance of I or the letter D in our plain text. Some letters only appear once in our keyword (D, B, H, R) so they don't get followed with a number. Writing the keyword and numbering each instance of the letter above the alphabet gives you this key:
Using the key above here is the first line of the original cipher text with the corresponding plain text written below it. For example, finding N in the Keyword column of the Key and the # 1 in the # column gives you the Plaintext of S.
Here is a typed out copy of the cipher text as it appears in the video
Here is the deciphered plain text maintaining line breaks as they appear in the video:
SOON COMES THE FALL OF ANOT
HER GREAT EMPIRE
THE FALL OF THE EAGLE IS ON TH
JOIN US. THE EAGLE IS INFEC
TED WILL SPREADD HIS DIS
WE AARE TTHE ANTIVIRUS
WILL PROTECT THHE WORLD
When overlaying the text on top of the subscript, it should be noticed that there are spaces in the text that havent been accounted for