Item #: SCP-091 Object Class: Euclid Special Containment Procedures: SCP-091 is stored in a modified subterranean arboretum. Containment zone is to remain lighted at all times. Four hydrargyrum medium-arc iodide lamps are to be active from 00:00 GMT until 16:00, at which point they are to be deactivated in sequence as the corresponding eight sodium vapor lamps are activated until 00:00 GMT. Lights must be replaced at the approximate time of bulb half-life, and only during the artificial nocturnal cycle. Officers with Level 4 clearance should refer to Document SCP-091b for further data.