Addendum 3115/01:
After 15 minutes have elapsed with a human subject listening to SCP-3115/A, SCP-3115/A will make additions to the standard broadcast.

SCP-3115/A will at random appear to say words, phrases, and describe abstract concepts which almost without exception prove to be cognitohazardous to the human subject listening.

Subjects which are exposed to the cognitohazardous vocalizations of SCP-3115/A will begin to display symptoms immediately. Symptoms increase drastically depending on the amount of vocalization additions heard. Once the original 15 minutes has elapsed there appears to be no correlation to the frequency of further additions.

Test 3115-01

Subject: D-88743
Procedure: D-88743 is directed to enter the containment chamber and plug SCP-3115 into a provided USB portable power pack and remain within the room for 5 minutes. D-88743 is not directed to wear SCP-3115.
Results: D-88743 follows instructions and reports faintly hearing a broadcast consistent with BBC Radio 1's morning show coming from SCP-3115. Note, D-88743 is near to SCP-3115. but is not wearing it. D-88743 is disconnects SCP-3115 from the power pack and exits the chamber without incident.
Analysis: Site-██ is shielded from all outside broadcasts. Audio output is later confirmed to be consistent with BBC Radio 1, however the means in which SCP-3115 has detected this signal is unknown.

Test 3115-02

Subject: D-88743
Procedure: D-88743 is directed to enter the containment chamber and plug SCP-3115 into a provided USB portable power pack. D-88743 is instructed to wear SCP-3115. D-88743 is permitted to leave the containment chamber after 5 minutes as per previous test.
Results: D-88743 follows instructions exactly. Upon wearing SCP-3115 D-88743 removes SCP-3115 stating surprise at hearing SCP-3115/A instead of a standard broadcast. D-88743 is instructed to place SCP-3115 on his head again which he does without argument. After 5 minutes has elapsed, D-88743 unplugs SCP-3115, removes them from his head and leaves the containment chamber.
Analysis: Audio output matches that of WKCS-FM. D-88743 is placed in observations for one week following test but shows no negative effects. D-88743 expresses reluctance to partake in further tests claiming that the voice of SCP-3115/A 'unnerved him'.

Test 3115-03

Subject: D-88743
Procedure: D-88743 is instructed to follow procedures as per Test 3115-02 however is instructed to remain within the containment chamber, wearing SCP-3115 for 16 minutes.
Results: Upon passing the 15 minute mark, D-88743 stands and appears panicked. D-88743 asks Research Staff how 'that guy' has been able to get into the room without using the only door (which was locked as part of testing procedures). Upon passing the 16 minute mark, D-88743 leaves the containment chamber complaining of a headache.
Analysis: D-88743 reports seeing the manifestation of SCP-3115/A. D-88743 is extremely paranoid following this test and has shown an aversion to wearing any form of headphones again. D-88743 was treated in the medical bay for a migraine and was placed under observation. During this time, D-88743 spoke aloud the cognitohazardous phrase he had heard from SCP-3115/A, exposing a member of medical staff to Stage 1 infection. Class A amnestics proved effective in neutralizing infection in both persons. D-88743 is terminated as per standard D-Class protocols at the end of the month.

Test 3115-04

Subject: D-4452
Procedure: D-4452 is instructed to follow procedures as per Test 3115-02 however is instructed to remain within the containment chamber, wearing SCP-3115 until instructed otherwise.
Results: D-4452 follows instructions exactly. D-4452 expresses similar symptoms to D-88743 after the 15 minute mark. At 23 minutes 6 seconds following activation of SCP-3115, D-4452 begins convulsing in his seat and speaking unintelligibly (now believed to be in Stage 6 infection). D-4452 rapidly begins vocalizing cognitohazardous phrases before expiring. During this test, 5 Research Staff were observing the test using both a visual and audio feed. All five personnel were infected immediately with Stage 6 infection on hearing the cognitohazard. This quickly spread to security personnel stationed outside. A containment breach was declared and all personnel removed from within earshot of infected persons. SCP-3115 was removed from D-4452's head with the assistance of Researcher Tann who is declared medically deaf. Post-mortem examination of infected personnel deduced the cause of death to be cardiac arrest.
Analysis This test caused a site-wide containment breach to be declared. A follow up investigation has lead to the current containment procedures. Testing to be indefinitely suspended pending a review by the Department of Internal Security.

INCIDENT REPORT IR3115-A

On the 4th April 2017 SCP-3115 underwent its first site-wide containment breach since containment was first established. This item had been considered relatively safe by research staff given its manageable anomalous properties and as such, major liberties were taken in containment of SCP-3115 resulting in less than safe conditions.

At 04:20hrs on 4th April 2017, five members from the Department of Research at Site-XX commenced Test 3115-04. This test was sanctioned by the Site Memetics Department in accordance with Foundation Policy and conformed to all containment procedures hitherto established. All personnel involved were experienced researchers with a variety of backgrounds in science and this was the fourth such test that this team had undertaken with SCP-3115.

The experiment required the use of one D-class personnel designated D-4452. The aim of the test was to establish the effects of prolonged exposure to the anomalous properties of SCP-3115 on human test subjects and the subsequent effectiveness of Class A amnestics on said subjects. Prior to this test, no test subject had been exposed to the anomalous properties of SCP-3115 for more than 16 minutes.

At the time the containment chamber was structurally sound, with sound proofing remaining at 100% effectiveness throughout the test. The cell was fitted with 3 standard HD CCTV cameras providing a view of all angles of the room. These cameras were fitted with standard audio microphones which could be switched on and off by the personnel in the observation booth.

At the commencement of the test, all cameras and microphones were activated by the research staff to document and monitor the test as it progressed. As per standard protocols for testing on SCP-3115, all microphones were altered to only pick up loud and deliberate sound in the room, so as to prevent accidental recording of SCP-3115’s anomalous audio.

At 23 minutes and 6 seconds after the commencement of the test, D-4452 began exhibiting symptoms of Stage 6 Infection of SCP-3115. D-4452 convulsed in an apparent epileptic fit for 1 minute and 32 seconds, falling from his chair in the process.

It has been found that the research staff made several errors at the commencement of Stage 6 infection. At the time that D-4452 entered the advanced stage, audio recording was disabled on the microphones. In an attempt to communicate with D-4452 to enquire as to his wellbeing and in order to gather more information of the current exposure, one of the researchers activated the microphones on the cameras. A two way communication was then opened which exposed all five personnel in the observation booth to immediate Stage 6 infection of SCP-3115.

The observation booth itself was not sound proofed as it was outside of SCP-3315’s containment chamber. Due to the volume of the researcher’s subsequent vocalisations, the sound permeated through the gaps in the door frame and exposed the two security guards stationed outside. Their vocalisations was then picked up by the CCTV cameras in the hallway which transmitted the infection to the Camera Control Operator in the Security Command Centre. The infection then spread throughout a small portion of the facility before the event was witnessed by a member of staff through a non-audio CCTV camera.

This staff member then activated the Site’s containment breach alarm and established contact with Security stationed outside of the Containment Wing. At this time the Site’s computer mainframe underwent an automatic assessment of the situation and updated the Site Director, informing him that the containment breach did not meet the required parameters for detonation of on-site warheads.
A further error in containment then occurred whereby further Security personnel entered the Containment Wing in order to re-establish containment, further spreading the infection to those personnel.

Site records indicate that proper safe working protocols were not followed by staff at the site during this containment breach. Standard operating procedures for an auditory anomaly undergoing containment breach states that Mobile Task Force Eta 11 – ‘Savage Beasts’ must be informed immediately. This procedure was not followed and MTF-Eta 11 were not informed until 14 minutes and 44 seconds after the activation of the containment breach alarm.

It is fortunate that Site-XX was home to personnel who are medically declared deaf. Researcher Tann in this case, had no previous experience working with SCP-3115 and was employed in a primarily back-office role. Notably, Researcher Tann only holds Level 1 Security clearance as a newer member of staff and as such was not authorised to be informed of the nature of SCP-3115 or even enter the Containment Wing. This breach of protocol is to be referred to the Department of Internal Security.
Researcher Tann was able to successfully remove SCP-3115 from the head of D-4452 and eject the USB from the socket, terminating the anomalous properties of SCP-3115. Using a decibel meter, Researcher Tann then confirmed that all personnel affected by SCP-3115 had expired prior to signalling the all clear.

Standard site operations resumed at 13.40hrs that day.

The incident resulted in the following casualties:
1x D-Class personnel
12x Research personnel
10x Security personnel
3x Clerical personnel
1x Janitorial personnel

The details of this report have been forwarded to the Committee for Post Incident Analysis and Mobile Task Force Eta 11 for their comment and endorsement. I await their response before submitting my findings to the Department of Administration in a Post Incident Review.

Colonel H. Briggs

Incident Review Bureau

Department of Security