Worker Falls Wearing Fall Protection
A worker wearing fall protection falls. 

Despite wearing fall protection equipment, the worker tied off to a guardrail which is not an acceptable tie off point.
The video shows a potentially dangerous situation in an industrial setting where a worker wearing a safety harness and protective gear loses his footing and falls into a deep, open pit. He is connected to a safety line that prevents him from hitting the bottom. The potential aftermath of the fall could have been severe injury or even death if not for the safety equipment. Although the aftermath wasn't shown, it's safe to assume he was likely shaken but unharmed thanks to the safety line. The environment suggests a professional setting with visible warning signs, and the worker appears to be trained for such situations.