Item number SCP-173 Object class, Euclid. Special containment procedures. Item SCP-173 is to be kept in a locked container at all times. An important personnel must enter SCP-173's container. No fewer than three may enter at any time. And the doors to be re-locked behind them. At all times, two persons must maintain direct eye contact with SCP-173 until all personnel have vacated and re-locked the container. Moved to Site 19 in 1993. The origin of the object, as of yet, unknown. SCP-173 is constructed from concrete and rebar, with traces of crylon brand spray paint. The reddish brown substance on the floor is a combination of feces and blood. The origin of these materials is unknown. The enclosure must be cleaned on a bi-weekly basis. Personnel assigned to enter the container are instructed to alert one another before blinking. Line of sight must not be broken at any time with SCP-173. The object cannot move while within a direct line of sight, because SCP-173 is animate and extremely hostile. The object is reported to attack by snapping the neck at the base of the skull, or by strangulation. In the event of an attack, personnel are to observe class 4 hazardous object containment procedures. Personnel reports sounds of scraping stone originating from within the container when no one is present inside. This is considered normal, and any change in this behavior should be reported to the acting HMCL Supervisor on duty. Item number SCP-173, object class, euclid, and a file.