Item #: SCP-21HU
*Object Class:* Euclid
*Special Containment Procedures:* SCP-21HU is to be contained in a domed underground chamber of reinforced ferroconcrete with an internal diameter of at least 200m and a maximum height of at least 25m. To protect the structural integrity of the chamber, the inner walls of the structure require a lining of highly resistant, heat-ablative compound material measuring no less than 12cm in thickness.
The ground within SCP-21HU's containment chamber is to be covered with 50cm of fertile soil all around, safe for a small gravel pathway leading to the structure's center. To ensure that plant life can grow within the chamber, its roof is to be covered in a network of small but powerful electric lights, which are activated and deactivated in sequence to simulate a 24-hour day/night cycle with the rise and set of the sun and moon, respectively. A set of sprinklers situated under the roof of the chamber are set to release water and fertilizing agents in regular intervals, and the ambient temperature of the chamber should be kept at precisely 25° Celsius. The ventilation system of SCP-21HU's containment chamber requires powerful filters to remove and destroy any pollen or other organic compounds from the air cycle of the chamber. Conversely, no plant species other than those already present in the chamber must be introduced to SCP-21HU due to potential mutagenic effects and the risk of exposing already altered material to the outside world.
Barring situations which could result in a containment breach, the interior of the containment chamber must under no circumstances enter conditions that prove detrimental to plant life.
In the event that SCP-21HU becomes agitated and may attempt a containment breach, the containment chamber is to be flooded with sufficient liquid nitrogen so as to lower the ambient temperature to -50° Celsius, sending SCP-21HU into a state of suspended animation and allowing for her temporary relocation into a cryo-chamber. Once repairs to the containment chamber are finished, SCP-21HU is to be reintroduced to the chamber and encouraged to regrow the plant life destrPost too long. Click here to view the full text.