What happened

A security guard entered the fenced movement area of an oil-well pumping unit while it was stopped in automated pump-off mode. The unit restarted without an advance warning and its crank and counterweight struck and killed him. Brazil's ANP investigation identified missing warning signs, unsafe positioning, automatic startup without warning, and failures in hazard communication and risk analysis.

When cited sources give different casualty, damage or spill figures for this event, they’re reported side by side above rather than merged into one number. See how confidence levels work.