<unk>  or<unk>  the<unk> s is any of various maneuvers used to make the pressure in the middle<unk>  become the same as the outside pressure, by letting air enter along the Eustachian tubes, as this does not always happen automatically when the pressure in the middle<unk>  is lower. This need usually arises in scuba diving, but can arise in fast descent in an aircraft or a mine cage, on being put into pressure in a caisson or similar.
Ear clearing
Ear pain
Ear pain  
Low-set ears
Low nose bridge
Buphthalmos
Brain zap
Red eye  