Скачать или смотреть Run Fast If You Ever See a Manhole Cover Bouncing Like This… 😳🚨

This video shows something that looks strange at first, but there is a simple reason behind it. When there is heavy rain, a huge amount of water flows into street drains in a very short time. Underground pipes are designed to move water away steadily, not all at once. When too much water enters too quickly, air gets trapped inside the system.

As the water keeps moving, it squeezes that trapped air and creates pressure beneath the street. Manhole covers are very heavy, but they are not locked in place. When the pressure below increases, it pushes upward on the cover. The pressure rises, the cover lifts slightly, then it drops back down when the pressure shifts. This cycle can repeat again and again, which is why the cover looks like it is bouncing on its own.

Certain areas experience this more often, especially low points in the road where rainwater collects, or places near tracks and slopes that guide water toward drains. This movement is a sign that the underground drainage system is working hard to handle the sudden flow. It is a clear reminder of how powerful water and air pressure can be, even when everything is hidden beneath the street.