Modern Carabiner damaged during climbing fall. The carabiner was found on the bottom of El Capitan with the gate on the outside. one theory on how that might happen was that the carabiner was slammed against the rock during a fall, which open the gate due to gate's inertia (a strong argument for using wire-gates carabiners). Than the carabiner was weighted when the gate was open, resulting in beyond normal flex, which allow the gate to swing open.