On August 13, 1985, César Omar CHESTA MOUSSET, 26 years old, a Second Lieutenant in the Navy, died.

A group of specialists, including Officer Chesta, prepared to deactivate an explosive device placed on the railway line in Peñablanca, a town located 20 kilometers from Viña del Mar. At that moment, the device detonated, resulting in injuries to Lieutenant Chesta that caused his death while he was being transported to the Quilpué Hospital. Other officials were also wounded in the same incident.

The autopsy report concluded that the cause of death was "polytrauma with a fracture of the base of the skull and cerebral contusion, thoracic trauma with pulmonary contusion, and traumatic amputation of both hands, caused by an explosion at very close range of some type of explosive device."

That same day, a series of bomb attacks occurred on the railway line in Peñablanca and at the Valencia Station in Quilpué.

The evidence provided allows for the affirmation that the Officer was performing service duties; likewise, it is reasonable to presume that these attacks had political motivations.

The Commission reached the conviction that Second Lieutenant César Chesta was a victim of human rights violations, as he died in the line of duty while attempting to deactivate an explosive device placed by individuals acting under political pretexts.