The submarine effect occurs when...

A) The seat belt is not able to properly restrain the body during an accident and the body slips below it.
B) The distance to the airbag is incorrect.
C) The headrest is poorly adjusted.

View explanation

The vehicle's seat belt should be fastened as close to the body as possible, laying flat without knots or twists, and tightly to prevent the submarine effect. It should never be worn loose, as this reduces its effectiveness, and it should not be placed over the abdomen directly but rather over the driver's or passenger's hips.

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