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From left, Max O'Roark and Joedy Yglesias put on caving helmets at Colorado Bend State Park.

From left, Max O’Roark and Joedy Yglesias put on caving helmets at Colorado Bend State Park. Credit: Brendan Gibbons / San Antonio Report

From left, Max O’Roark and Joedy Yglesias put on caving helmets at Colorado Bend State Park.