Read the following technical passage:
Combat vehicles utilize automated fire suppression systems to protect crew compartments from explosive penetrations. When optical sensors detect the characteristic ultraviolet radiation of an internal hydrocarbon fireball within five milliseconds, the control module triggers rapid-acting squib valves. These valves instantly discharge heptafluoropropane agent into the cabin, suppressing the thermal event before toxic gas thresholds are breached. To prevent accidental discharges during workshop servicing, technicians must physically insert a mechanical safety pin into the primary discharge initiator before disconnecting any wiring harnesses.
Based on the passage, complete the statement with the exact detail directly stated in the text: