Sacral room of the Templars at Lockenhaus Castle

Sacral room of the templar at Lockenhaus Castle, Austria

After walking through the Templar museum at Lockenhaus Castle I came across this mysterious room. It is supposed to be have been a sacred site of the Templars. Other voices say it is just a cistern. Anyway, the museum about the history of the Templars is worth a visit though.