Possible Clues:

• Hollow act regarded as wrong by our team
• Passage in the head
• Cavity in body (connecting to nose)
• Cavity walls in useless bridge?
• Source of light is set up in passage
• It's a little hollow so to do wrong with us
• Congestion location
• Kind of pressure that can cause headaches
• Kind of cavity
• Hollow pole on far side of the pond