Poorly secured **seat covers** can be dangerous because they make it easier for the driver to slide under the seat belt in the event of an accident. This phenomenon is known as the **submarining effect**.

- The submarining effect occurs when the body slides downward, under the seat belt, due to improper belt positioning and the seat being reclined backward.
- To avoid this effect, it is important not to place objects like towels, cushions, or covers on the seat, as they can make the driver slip more easily.
- Additionally, it is crucial to fasten the seat belt properly and ensure it is well adjusted to the body so that it fulfills its protective function in the event of an accident.

Therefore, poorly secured seat covers contribute to the driver sliding under the seat belt, increasing the risk of injury in an accident.