Exploding manholes are a rare but serious safety hazard that can occur when a buildup of pressure inside a sewer system causes a manhole cover to be forcibly ejected from the ground. This can happen when heavy rains, snowmelt, or other factors overwhelm the capacity of the sewer system, leading to a buildup of water and pressure. Additionally, if there is a blockage or obstruction in the sewer line, the pressure can also increase and lead to a manhole explosion.

When the pressure becomes too great, the manhole cover is forced upward, often sending it flying into the air. The force of the explosion can also cause fragments of the manhole cover to be propelled at high speeds, creating a dangerous situation for anyone in the vicinity.

Exploding manholes can cause serious injuries, including head trauma, broken bones, and lacerations. It is important to be aware of the potential for exploding manholes, especially during periods of heavy rain or snowmelt, and to avoid walking near sewer grates or manholes. If you see a manhole that appears to be bulging or raised, it is important to report it to the proper authorities immediately.