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Automakers have increasingly turned to laminated acoustic glass to drown out highway noise and keep modern cabins whisper-quiet. While excellent for a peaceful commute, a new study by Korea's National Institute of Fire Service reveals that this luxury upgrade poses a hidden danger during an underwater emergency. The very material designed to protect you from exterior noise could trap you inside a sinking vehicle.
The classic automotive survival playbook — grabbing the seat headrest and smashing the side window with its metal prongs — is dangerously outdated.
The institute's survival simulations showed that on standard tempered glass, using a headrest prong is incredibly difficult because the car's rubber molding and window frame absorb the brunt of the impact. However, if you use a dedicated emergency tool like a rescue hammer or a spring-loaded punch, tempered glass shatters relatively easily, provided you avoid the center and aim repeatedly for the corners.
If your vehicle is equipped with laminated acoustic glass, you are facing a literal brick wall. Because of a tough, plastic safety film sandwiched between the glass layers, heavy rescue hammers and tactical punches only leave localized, spiderweb dents. Breaking through it to create an escape hatch in a rapidly filling cabin is nearly impossible under pressure.
