The Shadow In The Glass

The Shadow In The Glass is a Hazard of unknown classification. Current status 2?.

Location
The pane of glass containing this Hazard is stored underwater in Hazard Zone 2-3, within Secure Room 6.

No personnel with lower than Class 4 Clearance may enter.

Attributes
The Hazard consists of a 0.8 metre by 1.7 metre ████-brand pane of frosted glass, made around 1860. If viewed head-on, a human shadow can be seen as if a figure was pressed up against the surface.

If viewed from the back, no anomalous behaviour can be detected.

Log 341-T: Attempted Destruction
Equipment used: 1 pneumatic drill, held by Class 1 personnel. Four observing

Result: On contact with the glass surface, all light in the area went out. The drill-wielding personnel was gone, replaced by a ██-year old woman incapable of speech. Shadow seen as usual, though a change in height has been recorded.