No it is NOT legal, AND it's dangerous. Manholes are covers for many utility lines and anything within them is either private property (phone company - cable company - water company - etc) or government property. You would be trespassing. ADDITIONALLY - dangerous gases and oxygen depleted air collects in manholes and if you descend into one you could be overcome and die.
Because they are meant for a man to go through them
There are approximately 100,000 manholes in Manhattan.
Manholes are human access points for when the sewer system needs maintenance or repair.
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If they were rectangular they could fall down the manhole.
Outside diameter (OD) of adjacent manholes (including the bottom slabs) should have minimum of five (5) feet horizontal clearance.
The legal age to enter a bar in Nebraska is 21. You can enter a bar at any age as long as you are in the company of your parents or your legal guardian.
Seventeen years old is the age you can enter into a contract in Tennessee. The legal age however is still eighteen.
The legal age to enter a night club in Louisiana is 18 but you can't drink unless you are 21.
it is maximum 120 m .
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If you have permission by the government to enter the country (for visit, work, school, etc...) then you are a LEGAL alien If you DO NOT have permission by the government to enter the country, then you are an ILLEGAL alien