A vacuum chamber over-pressurized while a researcher was returning the vacuum to atmosphere by venting with nitrogen from a gas cylinder. The chamber was left to fill while the researcher worked on other tasks. By the time the researcher returned, the chamber had over-pressurized and the view window shattered.
The researcher sustained multiple cuts to the face, three of which required stitches on their forehead. Their injuries could have been worse if it weren't for an aluminum panel that deflected pieces of glass. Visible dents in the panel were noted after the incident.