Prompt: Brought to Area 19 in 1993. Origin is still unknown. Made of concrete and rebar with traces of Krylon spray paint. SCP-173 is animate and extremely hostile. The object cannot move while within line of sight. Eye contact should never be broken when working with SCP-173. Personnel assigned to enter the container are instructed to warn each other before blinking. The subject is reported to attack by breaking the neck at the base of the skull or by strangulation. In the event of an attack, personnel must use Class 4 hazardous object restraint actions.