Schwarzschild Machine

Item: SCP-####
Object Class: K̶e̶t̶e̶r Euclid

Special Containment Procedures:
SCP-#### is contained in the residence of the late Steven Hawking, whose personal research notes outline the method of containment and description. Access to the containment area is to be restricted to Class 3 or higher personnel, with the exception of qualified engineer staff chosen by Project Head [DATA EXPUNGED].
SCP-#### is to be kept in a hermetically sealed container of Tungsten no less then a meter thick. This container, designated the Hawk Box, is to measure ten meters in height, eight meters in length and width, and is to be kept in a constant vacuum state. The exterior of the Hawk Box must be wrapped in a sheet of Vantablack carbon nanotubing as to keep light photons from penetrating into SCP-####. Qualified engineer staff must check for any signs of structural damage on an hourly basis. If signs of structural damage are detected, Project Head [DATA EXPUNGED] is to be notified immediately.
In the event of containment breach, the entirety of Cambridge must be evacuated, including any and all forms of matter twenty grams or less in mass. This will not only ensure a minimal loss in civilian life, prevent an XK-Class end of the world scenario. This evacuation is to be ordered under the guise of a gas attack by a variety of British based terrorist groups. The construction of a new Hawk Box is to begin immediately, with the finished product being air lifted directly to SCP-####, and then dropped on top of it.

Description:
SCP-#### is a hollow cuboid measuring three meters in height, four meters in length and width, and five hundred kilograms in mass. Multiple tests have concluded that SCP-#### is made out of an as of yet unknown material, with trace amounts of a metal based mercury. One of the outward faces, designated SCP-####-2, appears to exist in shape only, as any form of matter is able to pass through it. The hollow space within SCP-####, designated SCP-####-3, is completely black, with no form of detectable light being emitted from it.
Once any form of matter has entered SCP-####-3, it will instantly be crushed into it's Schwarzschild Radius, creating a black hole. The process is possible due to [DATA EXPUNGED]; and SCP-####-2's ability to block out the gravitational pull coming from SCP-####-3, while still exerting a gravitational pull strong enough to attract objects with a mass of twenty grams or less.
Due to the process of Hawking Radiation, these black holes will have an unimaginably short life span. However, at the end of a black holes life span, an incredible amount of energy is released. Objects with the mass of less then one hundred amu's (Unified atomic mass unit) pose nothreat to the Hawk Box, but if an object more massive then this penetrates the Hawk Box it could cause structural damage. As a general estimate, for every gram of mass a black hole has, it will release twenty kilotons of energy at the end of it's life cycle.

Addendum One: Letter from Project Head [DATA EXPUNGED] to O5-██
It appears as if SCP-####-2 not only cancels out the gravitational pull coming from inside SCP-####-3, but also cancels out the amount of energy released by a black hole with a mass of 95 amu's or less. With this knowledge in mind, I'm formally requesting that SCP-#### be demoted to a Ecluid class anomaly, as both the Vatablack carbon nanotubing and the Hawk Box are sufficient in preventing objects this massive from penetrating into SCP-####-3
Addendum Two: Letter from O5-██ to Project Head [DATA EXPUNGED]
By vote of the O5 Council, we hereby approve the demotion of SCP-#### from a Keter class anomaly to a Euclid class anomaly.