NOC +10

On March 6th, 2015, a YouTube channel named "Noc +10" was created. Since that day, this channel is uploading some really darkly mysterious videos. I will start saying something about the name of this channel, which is pretty odd, indeed: searching on Google for "NOC +10" you can easily find out that it may refer to the Naval Operation Concept 2010, also represented with the acronym "NOC 10".

1. First contact – March 7, 2015

0101 0101 0000 0001

The first video uploaded by Noc +10 on March 7th 2015, is entitled 0101 0101 0000 0001: this immediately lets us think of some sort of binary code. It’s divided in blocks of four bits, but we do not know its meaning. This video is composed by an odd old-oscilloscope-like display showing some distorted letters and words. Let’s break it down:

• It starts displaying the string NOC+10, with a background piano music, which is easily recognizable: it’s the Nocturne Op. 27 No. 1 in C# minor by Fryderyk Chopin.
• The screen goes black for a bit, the music stops, and a low-tone noise starts: the word START appears.
• A series of letters is displayed, spelled by a female computerized voice: JKnjGvPaITB, preceded by the string ?v=.
• When the voice finishes spelling the letters, the word END appears, and the video stops after a few seconds.

Looking at the string ?v=JKnjGvPaITB, we can easily think of an ID of some YouTube video, but the string itself is encrypted, and it doesn’t exist a video with such ID. By the way, applying the famous Caesar cipher to this ID we can decypher it and find the ID GHkgDsMxFQY, which is a valid YouTube video ID.

A lot of other questions came to my mind watching this video: is "Noc" related to "Nocturne" in some way? What does the song mean? Etc.

2. First hidden video – March 7, 2015

0101 0101 0000 0010

The ID found on the first video leads us to this unlisted video, uploaded earlier in the same day by the same channel, entitled 0101 0101 0000 0010. The first thing we notice is that the name of the video is almost equal to the previous one, but actually the last 4 bits are different: 0010. The video title changed from ending with 0001 to ending with 0010: it’s clear that the two names of these videos are consecutive binary numbers. Let’s see what’s inside this second video as well:

• The video starts with an high frequency noise, and the string NOC+10 is displayed.

• Then a sudden cut of the video brings us to a long string of apparently random uppercase letters, ending with a bunch of zeros:

   RKKHOHQKDGDVWHDPERDW
   WKHVWHDPERDWKDGDEHOO
   ZKHQKHOHQZHQWWRKHDYHQ
   WKHVWHDPERDWZHQWWRKHOO
  
   0000000000000000000000
  

The same background music is played alongside with the same female voice spelling this sequence of letters.

• The video ends a few seconds after the voice has finished spelling all the code.

Applying the Caesar cypher again to the code, we can decipher it:

RKKHOHQKDGDVWHDPERDW   -> OHHELENHADASTEAMBOAT
WKHVWHDPERDWKDGDEHOO   -> THESTEAMBOATHADABELL
ZKHQKHOHQZHQWWRKHDYHQ  -> WHENHELENWENTTOHEAVEN
WKHVWHDPERDWZHQWWRKHOO -> THESTEAMBOATWENTTOHELL

0000000000000000000000 -> These zeros don't seem to have any meaning

Splitting the code in the right parts, we can distinguish a sort of doggerel, which says:

Oh Helen had a steam boat

The steam boat had a bell

When Helen went to heaven

The steam boat went to hell

This rhymes, particularly the first verse, make us think about the Miss Susie american schoolyard rhyme, maybe a variation of it? Looking on Wikipedia on the Miss Susie page, we can find a linked article: SS Sultana tragedy (1865), the greatest maritime disaster in United States history. Well, let’s say it: this looks freaking mysterious and gloomy!

3. Second contact – March 12, 2015

0101 0101 0000 0011

A third video, this time public, is uploaded by Noc +10 five days after the last one, and its title is 0101 0101 0000 0011. If we had a suspect of the names of the videos being consecutive binary numbers, now it’s clear! Again, let’s analyse this third video like we did with the previous ones:

• It begins with the usual NOC+10 string, with the same Chopin music in the background.

• A long string of numbers and letters is displayed on the screen:

   6D3248656C6C6F4166776F726C645156
    68656C656E79324937367761697459
  

This makes us think about some sort of hexadecimal string, because the letters which appear in this string do not overcome the letter F, which is the greatest valid hexadecimal digit.

• A male voice makes 16 equal and unrecognizable sounds while the above string is displayed on the screen, and the video ends: this confirms our thesis about the hexadecimal string.

Applying the Caesar cypher doesn’t seem to work this time, but I tried translating it from hexadecimal character pairs to ASCII characters, and the result is even creepier than the previous one:

6D3248656C6C6F4166776F726C64515668656C656E79324937367761697459
   ↓
m2HelloAfworldQVheleny2I76waitY

This seems to be some text alternated with two-character strings inserted to split the words. The result, removing the exceeding characters is:

Hello world helen I wait

But what about the removed characters? They look familiar: m2AfQVy276Y, YES! They represent another YouTube video ID!

4. Second hidden video – March 12, 2015

0101 0101 0000 0100

The fourth video, found with the ID extracted from the third, is unlisted, and has been uploaded by Noc +10 earlier in the same day of the previous one. Its title is 0101 0101 0000 0100. These consecutive binary numbers keep going on. This video also comes with a lot more of information than the others:

• It begins with the same NOC+10 introduction, the same Chopin music is played.

• A video cut shows another frame with some text which doesn’t seem to be encrypted this time:

   SYSTEM 00033 DECEASED
   SYSTEM 01090 DECEASED
   SYSTEM 00010 ALIVE
  

Another song begins to play: looks like an old song from the ’70s.

• Then a longer, more detailed text:

   PRESSURE WATERTIGHT STABLE
   SECTOR 1 STABLE
   SECTOR 2 STABLE
   SECTOR 3 STABLE
   SECTOR 4 PRINCIPLE OF FLOODING
   SECTOR 5 STABLE
   SECTOR 6 SIGNAL MISSING
   SECTOR 7 STABLE
  

• Now the phrase THERE'S ANOTHER MOTHER TO SLEEP HERE appears, and a male voice spells the letters L-I-O-U-Y, then the video ends.

This video seems to be the most important so far: it’s clearly full of connections and riddles to solve. It also leads to a large amount of other questions:

• What are these SYSTEMs referring to?
• Are these SECTORs part of a ship? Maybe the SS Sultana?
• What does LIOUY mean?
• Maybe "another sleeping mother" means another deceased system?
• Do these two screens have anything to do with the SS Sultana tragedy?

Let’s see if we can answer some of them:

• The string LIOUY was used as an old cablegram Commercial Code, meaning "Why do you not answer my question?".

• A partial anagram of the phrase THERE'S ANOTHER MOTHER TO SLEEP HERE gives us:

   THERMOSTAT ERROR NO SLEEP
  

• It also looks like the famous SS Sultana tragedy is connected to these last videos. Quoting from the Wikipedia page (linked above):

[…] Near 2:00 in the morning on April 27, 1865, when the Sultana was just seven miles north of Memphis, her boilers suddenly exploded. First one boiler exploded, followed a split second later by two more. The cause of the explosion was too much pressure and low water in the boilers. There was reason to believe allowable working steam pressure was exceeded in an attempt to overcome the spring river current. The enormous explosion flung some of the passengers on deck into the water, and destroyed a large section of the boat. […]

As this story goes on, I’m more and more inclined to think that these SYSYEMs and SECTORs are referring to the SS Sultana.

5. Third contact – March 19, 2015

0101 0101 0000 0101

A fifth video is uploaded by Noc +10 seven days after the previous one. This video, entitled 0101 0101 0000 0101, is the third public video, and it has been uploaded on March 19th.

Again:

• Same song and NOC+10 string.

• A female voice emits four equal and incomprehensible sounds, and a code is displayed on the sceen:

   A oYzXqoELKjE 14
  

The female voice, if played backwards, seems to be pronouncing P.I., you can listen to it here^{*link may expire}. May these two letters refer to $pi$ (irrational number Pi)?

The code provided by this video seems to be containing another YouTube video ID, which is oYzXqoELKjE, but there’s no video with such ID. Also applying the Caesar cypher to it doesn’t provide any valid video ID. Maybe there’s some hidden information in the other three characters A 14, some information about how to decypher the ID?

Common points

All the videos begin with the same introduction. All the video titles are represented by an increasing binary number divided in 4 blocks of 4 bits. If we translate the numbers into decimal notation we obtain the numbers 5501, 5502, 5503, etc. It looks like the sequence of the video public settings is: public, unlisted, public, unlisted, etc. All the unlisted videos were found decoding data provided by the previous public videos, this makes us believe there’s a sixth hidden video which has got to be found analysing the last video’s data.

---

Can you crack the last video’s code and find the ID of the next one?

---

Summary

This is a short summary which synthesizes the developments since the first video was found:

#1 0101 0101 0000 0001 - 2015/07/03 - public
 |
 |- Video URL: youtube.com/watch?v=NCAUPuXzn4U
 |- Encrypted data: "?v=JKnjGvPaITB"
 |- Decrypted (ROT23): "?v=GHkgDsMxFQY"
 |
 |- The decrypted video ID brings us to video #2
  
#2 0101 0101 0000 0010 - 2015/07/03 - unlisted
 |
 |- Video URL: youtube.com/watch?v=GHkgDsMxFQY 
 |- Encrypted data: [long, see above]
 |- Decrypted (ROT23): "Helen had a steamboat..." rhymes
 |
 |- Unknown meaning of the decrypted data
 
#3 0101 0101 0000 0011 - 2015/12/03 - public
 |
 |- Video URL: youtube.com/watch?v=AHtiPxfPSu4
 |- Encrypted data: [long, see above]
 |- Decrypted data (HEX to ASCII): 
 |  |- The phrase "Hello world helen I wait"
 |  |- Another video ID: "m2AfQVy276Y"
 |
 |- Unknown meaning of the phrase
 |- The decrypted video ID brings us to video #4


#4 0101 0101 0000 0100 - 2015/12/03 - unlisted
 |
 |- Video URL: youtube.com/watch?v=m2AfQVy276Y 
 |- Plain data: [very long, see above]
 |
 |- Unknown meaning of the data

#5 0101 0101 0000 0101 - 2015/19/03 - public
 |
 |- Video URL: youtube.com/watch?v=-qrtM4LdHH0 
 |- Encrypted data: "A oYzXqoELKjE 14"
 |
 |- Unknown encryption tecnique
 |- Unknown meaning of the data
 |
------ mystery solved ------
 |
 |- Decryption key:
 |  |- Decimal digits of Pi from 10th to 20th, as suggested by the two hex numbers 'A' and '14'
 |
 |- Decrypted (Gronsfeld Cipher): The video ID "jQqQhlCICfY"

Waiting for other revelations

I spent a bunch of time around this, but didn’t succeed in identifying the next video (if there is any). By the way, this series of riddles seems really interesting and challenging to me!

The first 4chan thread about this has been unfortunately archived, but contains a lot of useful information about the first four videos. Another thread has been opened on March 19 2015, relatively to the fifth video, and it may be helpful in order to find more hidden clues.

This chatroom has been created to discuss about the topic and arrange some ideas to find the next video. The chatroom has been frozen for inactivity on May 24th, 2015. By the way you can still read the existing messages.

Updates

• March 20, 2015 – update #1: added a link to a second 4chan thread about the fifth video; added the "common points" section; added a summary of the progress made until now.
• March 20, 2015 – update #2: added a quote from the SS Sultana Wikipedia page in the fourth video section: it seems to be related to this mystery.
• March 20, 2015 – update #3: added a link to the chatroom created by Bobson (thanks!). Anyone interested is kindly welcome!
• March 24, 2015 – update #4: the second 4chan thread has been deleted.
• April 13, 2015 – update #4: the first 4chan thread has been deleted.
• October 22, 2015 – update #5: the chatroom has been frozen for inactivity.

Notes

I will keep this post active and update it if there is any relevant step forward to the solution of the NOC+10 mystery.
The next part of the mystery is being investigated in this thread: The Mystery of Noc +10, Part 2

A oYzXqoELKjE 14

Encrypted:  oYzXqoELKjE - 
Shift by:   58979323846 =
Decrypted:  jQqQhlCICfY

http://www.youtube.com/watch?v=jQqQhlCICfY

      16.125628 147.681617
      I REQUIRE ASSISTANCE
ASSIMILATION OF SYSTEMS DECEASED