CORYDON, Ind. (AP) – Conservation officers say a man who was part of a group of cavers exploring a treacherous southern Indiana cave died after he became unresponsive during the grueling outing.

Conservation Officer Jim Schreck says 49-year-old Timothy McLain of Brownsburg, Ind., died Saturday evening in Blowing Hole Cave near Corydon about 25 miles west of Louisville, Ky.

His body was removed from the cave early Sunday and an autopsy is scheduled.

Schreck says McLain was an experienced caver who was with other cavers between two and three miles into the cave when he became unresponsive. His cohorts tried unsuccessfully to revive him.

Blowing Hole Cave is part of the sprawling Binkley Cave system and is treacherous, with chest-deep waters and tight crevices requiring cavers to take part in strenuous crawls to maneuver.