How IT Happens 
If you see manhole covers moving like this while walking, getting away from there can save your life. This is a rare occurrence, but there are two reasons why manhole covers may behave this way. The first reason could be due to heavy rainfall. However, the second reason is more dangerous: gas accumulation or high pressure can cause manhole covers to pop out in underground infrastructure like sewer or gas lines, which can lead to serious injuries.
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About The Author
It just wanna dance
The ninja turtles just dropped in there