Per 
Special Containment Procedures: SCP-6789 is to be kept at any cost in a room of at least 20.80m in diameter and width and must have an "anti-sound" device on Site-81, where SCP-6789 has to always keep in his cell and can not be released ANY time, whose occurrence a breach the cell of SCP-6789 has to at least try to handle it closed so there is no consequences of its exit at any cost. Access to SCP-6789 is denied by Council 05 and can not be opened until Council Order 05-3. If any command from the O5-3 Council is given, it is to follow the following protocol. At least two Class-D personnel must enter, the D-Class has to be guarded by a thermal vision system and nothing more, and with at least one heart-beat screen for each. At no time should a scientist enter the cell of SCP-6789 and no Guard other than the MTF Gamma-5 Staff in case of any breach and just that. Any attempt to open the SCP-6789 cell without Council O5-3 notice may lead to immediate execution. At least two guards armed and trained for humanoid hostility of any kind are to a SCP to a human.
SCP-6789 standing next to a wind turbine
Description: SCP-6789 is a humanoid containing 40 feet in size, It has heavily emaciated, near-skeletal frame covered in dried, mummified flesh with a color similar to rusted metal or tree bark, which it uses for camouflage. Its limbs are disproportionately long and thin, with arms almost as long as its entire body that ends in huge, bony hands.
Where a human's head and neck would be is a thin pole of flesh with two sirens attached to them facing in opposite directions (hence its name), and several black wires snaking around its "neck" and into its upper shoulders, pressed against its abdomen. The speakers are fused to the neck by tendrils of skin and capable of swiveling around, much like the head of an owl.
Some images depict, SCP-6789's speakers with toothy, lip-less human-like jaws and a long, retractable thin snake-like tongue, SCP-6789 seems to be able to communicate using radio broadcasts, being able to pick up signals from various places and even other unknown dates with certain phrases to set up a dialogue, and also imitating Nuclear Invasion alarms and so on.
Therefore, SCP-6789 can control the audio of the transmission as much as it wants, and may even cause immediate death or even coma, its appearance seems to be well malnourished and of an obscure coloration as if burned and very well by its smell of burned flesh It is theorized that SCP-6789 can cause a false alarm of Nuclear War and end up creating one.
Discovery: SCP-6789 was discovered by the Himalayan mountains in 1986, shortly after reporting high Invasion alerts and huge phrases taken from the next radio playing in a loud volume, all in an unimaginable mile radius. And there were also rumors of people going through the area where SCP-6789 was discovered and never seen again. The Foundation soon made an evacuation in the area near where SCP-6789 was and soon made the operation to learn the entity, where there was a huge failure, The unit ██████ ended up reporting a huge ringing alarm, which ended up doing half of the troop being deaf and the other half having immediate death due to the great sound incredibly to have exploded the brains of the personnel ██████. The rest of the troop would have made a half-turn, where two more personnel were caught and ripped at the hands of SCP-6789, causing at least 14 deaths on that mission, on the second attempt a bomber was sent to drop a bomb on the entity, huge effect that temporarily damaged SCP-6789, causing the Foundation to restrain the entity.Addendum 6789.1: First visual contact made by the Unit ██████ in ██ / ██ / 1986 at ██: ██ at night.
Addendum 6789.1: First visual contact made by the Unit ██████ in ██ / ██ / 1986 at ██: ██ at night.
Note: Following is the dialogue made by the unit when they first made contact with the entity, there is no history of any audio due to the huge sound made by SCP-6789 can damage the device as well as the person who is reading.
Unit ██████ was moving its troop to the location of SCP-6789, only three individuals were with microphones to pass the description of their acts to the Command.
[BEGIN LOG] Alpha: Certain command. We are moving towards the entity, you copy? Command: Yes, Alpha, doing staff count. Bravo: Here. Foxtrot: Here. Command: Alpha, lead the way to the entity, it is some 30 kilometers from you. Alpha: Okay, you heard the command, come on. [END LOG]
From here, the troops of the unit ██████ reached 10 meters from the entity until the described sound was heard, causing the deaths of the agents, the audio of the microphone was soon burst after the signal, not being able to receive even the cries of pain from the rest
Addendum 6789.2: An SCP-6789 drawing found in a cave in north america foundation agents went in to the cave they see A cave drawing of SCP-6789 attacking humans, which shows that SCP-67896 has been on earth for a long time from that SCP-6789 has been many years old
a cave drawing of SCP-6789 attacking humans
Addendum 6789.3: An SCP-6789 attacking a town 20 people died form SCP-6789 and SCP-6789 was contained and transport back to site-81
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