If nothing prevents its effective operation, which passive safety system prevents the submarine effect from occurring in the event of an accident?

# Explanation The **seat belt** is the passive safety system that prevents the submarine effect during an accident. This effect occurs when the body slides downward under the belt during a frontal collision. The belt, when correctly positioned over the pelvis and chest, keeps the occupant in place and distributes the impact forces safely, preventing serious injuries. It is essential to wear the seat belt fastened at all times to ensure its effectiveness.