At what water depth does the pyro vest inflate?

At what water depth does the pyro vest inflate?

• A. 1 ft
• B. 3 ft
• C. 5 ft
• D. 10 ft

Answer: (B)

Automatic inflators use hydrostatic pressure to decide when to deploy. For this pyro vest, the inflator is set to trigger at about three feet of submersion. When you reach that depth, water pressure activates the pyrotechnic cartridge and the vest inflates quickly, giving you buoyancy. At only one foot, there isn’t enough pressure to fire it, so it stays deflated. In deeper water, the trigger would have already fired as you passed the three‑foot threshold, so you’d be inflated and buoyant.

Automatic inflators use hydrostatic pressure to decide when to deploy. For this pyro vest, the inflator is set to trigger at about three feet of submersion. When you reach that depth, water pressure activates the pyrotechnic cartridge and the vest inflates quickly, giving you buoyancy. At only one foot, there isn’t enough pressure to fire it, so it stays deflated. In deeper water, the trigger would have already fired as you passed the three‑foot threshold, so you’d be inflated and buoyant.