At about 8 p.m. Saturday, a 50-year-old man was rescued from a silo in Walker Township.
First responders were dispatched at about 6 p.m. for a confined space rescue at 452 Zionback Road.
Walker Township Fire Department Assistant Chief Ryan Hockenberry said the man was trapped about 35 feet from the ground.
A fire official said the man had been working in the silo Saturday, when he became unconscious, likely due to fumes trapped within the silo during the winter.
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He was reportedly discovered by his son, who called first responders.
He later regained consciousness and was extricated from the silo at about 8 p.m.
He was taken from the scene by ambulance for medical evaluation.
Walker Township, Undine and Pleasant Gap fire departments and Bellefonte EMS responded.