Item #: SCP-NC691
Object Class: Safe
Special Containment Procedures: SCP-NC691 is to be stored at all times in a sound proofed anomalous item storage unit located at least 5 meters from electrical outlets or other anomalous objects with electrical properties or effects.
Access to SCP-NC691 is restricted to any personal below level 3 security clearance without the express permission of the site director.
Description: SCP-NC691 is an air conditioning unit of unknown make or model and bares no manufacturers markings. The plastic outer case shows signs of severe wear including cracks and yellowing of the plastic, despite this SCP-NC691 appears to be impervious to physical damage implying the object was deliberately created in a damaged state or somehow became anomalous some time after its initial manufacture.
SCP-NC691s anomalous effect manifests when it is plugged into a standard american 120v electrical outlet and turned on. When in this state SCP-NC691 will initially appear to be a normal air conditioning unit albeit a particularly loud one; however while in use SCP-NC691 will under all circumstances be precisely 9.1 decibels louder than any other noise in the vicinity. The increase in volume is coincided by a matching increase in power with the object releasing colder air at higher velocities as the sound level increases. Due to the logarithmic nature of the decibel scale cross testing between SCP-NC691 and other sound producing or amplifying anomalies is forbidden without written permission by at least 2 members of the O5 council.
Experiment Log #NC691-01
Test Procedure:
SCP-NC691 was exposed to a sound level of precisely 70 decibels (normal human conversation) in order to establish an accurate baseline of its effect.
Result:
SCP-NC691 produced a sound of 79.1 decibels with no other effects observed.
Experiment Log #NC691-02
Test Procedure:
A member of site security was instructed to enter a containment room with SCP-NC691 and discharge his firearm.
Result:
Security guard suffered short term hearing loss, staff involved were re-assigned.
Experiment Log #NC691-03
Test Procedure:
A class-D subject was placed in a sound proofed containment chamber with SCP-NC691 and instructed to set off a large fire cracker.
Result:
Containment chamber observation window was shattered resulting in several researchers suffering minor lacerations and temporary hearing loss, class-D subject was permamently deafened. Testing with sound sources above 150 decibels banned until further review.
~~Experiment~~ Incident Log #NC691-04
~~Test Procedure~~ Incident:
Junior researcher Hugh for unknown reasons, potentially related to a dispute with a superior on the day prior, broke into an on-site maintenance area where equipment used my MTF Eta-11 (“Savage Beasts”) was being serviced and gained access to a [REDACTED] intended for use against sound based anomalies.
On the following day when testing began junior researcher Hugh excused himself from the test area and subsiquently remotely activated [REDACTED] inside the containment cell being used for testing with SCP-NC691.
Result:
A sound possibly exceeding 194 decibels (the theoretical maximum under normal atmospheric conditions) was produced by SCP-NC691; This is, in addition to a powerful shockwave, theorized to have produced a large atmospheric cavitation bubble that resulted in the subsiquent implosion of the containment area and severe damage to surrounding parts of the facility. All staff within the containment area including junior researcher Hugh are believed to have been killed immediately though sufficient remains could not be recovered to perform an autopsy, in addition several deaths and numerous injuries were suffered by site staff in surrounding areas with the widespread damage resulting in multiple low level containment breaches.
Following this incident several members of site security were disciplined for their failure to prevent the theft of equipment, and a petition was made to re-classify SCP-NC691 as Euclid, though this was later denied.