LOUISVILLE, Ky. (AP) _ A student was rescued Saturday from an air duct in a building at the University of Louisville, apparently stuck there for several days.

Rescuers worked for two hours before freeing Jerry Lyvers, 19, of Loretto, from the base of the air passage in the school's humanities building.

Lyvers was in stable condition Saturday night at Humana Hospital Audubon. He suffered a broken arm and ribs after tumbling about 40 feet, officials said.

He told police that he could not remember how he ended up in the air duct. However, the student's friends told authorities that Lyvers had explored similar areas in campus buildings when he felt bored.

Lyvers, who studied chemistry and electronics at the university's Speed Scientific School, was last seen in his dormitory Wednesday morning, said Denise Fitzpatrick, a university spokesman.

No one knows how long he had been there, she said.

Friends and campus officials had been stymied in their search for him.

But Saturday a faculty member in a third-floor restroom of the humanities building heard a call for help coming from a mechanical room. The teacher alerted authorities, who found Lyvers in the passageway below.