Object Class: Medium

Secure Containment Guidelines:

 DA-066 is to be contained within a soundproofed chamber measuring 5 meters by 5 meters. The chamber's walls, floor, and ceiling should be constructed with reinforced concrete and lined with a layer of acoustic foam. The door to the chamber must have at least two layers of soundproofing material and an automatic locking mechanism.

No personnel are allowed to enter DA-066's containment chamber without proper ear protection. Audio monitoring equipment is to be installed within the chamber to detect any variations in the sounds emitted by DA-066. The chamber must be inspected weekly for signs of degradation or structural instability.

Description: 

DA-066 is an anomalous rock composed of an unknown type of basalt-like material. It measures approximately 2 meters in height and 1.5 meters in width and displays no other distinguishing features. DA-066 is stationary and cannot be moved or lifted by conventional means.

DA-066 emits an ambient rock melody at a consistent volume of approximately 75 decibels. The melody varies in intensity and complexity, often incorporating different instruments and musical motifs. The melody has a calming effect on individuals within hearing range and can induce a sense of tranquillity and well-being. Listeners have reported feeling an inexplicable compulsion to remain in proximity to DA-066 for extended periods.

When exposed to DA-066 for prolonged periods, subjects have shown increased levels of relaxation and reduced stress. However, continued exposure beyond four hours leads to a gradual decline in physical health. Prolonged exposure can result in symptoms such as fatigue, muscle weakness, decreased appetite, and an overall decline in bodily functions. If left untreated, these symptoms can lead to severe debilitation and potentially death.

DA-066's anomalous properties extend to its effect on audio recording devices. Attempts to record DA-066's melody using conventional audio equipment have proven unsuccessful. Recordings capture only a faint, distorted version of the melody, rendering them almost unrecognizable compared to the actual experience of hearing DA-066 in person.

Addendum: Incident DA-066-01: During routine maintenance on ██/██/20██, a hairline fracture was discovered on the surface of DA-066. Within 24 hours, the fracture expanded, causing a sudden increase in volume and complexity of DA-066's melody. The intensity of the melody surpassed safe hearing levels, resulting in severe auditory trauma for several on-site personnel.

Emergency containment procedures were initiated, and the chamber was reinforced to prevent any further escalation. After approximately 72 hours, the fracture sealed itself, and DA-066's melody returned to its normal state. The incident highlighted the potential risks of containment breaches and the need for ongoing monitoring and reinforcement.

Further research into DA-066's origin, purpose, and potential applications is ongoing.