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1

In a search engine look up public toilet regulations. Regulations for public toilets can vary by jurisdiction (country, state or province, municipal authority). Most national standards organizations have standards for public toilets. Some regulations I've seen online state the sizes for toilet cubicles, heights of toilet seats & the height a coat hook ...


15

The Kidd Mine in Ontario, Canada: per the Wikipedia article, it is "the deepest accessible non-marine point on Earth" at "2,733 metres (8,967 ft) below sea level". I found this from the Wikipedia article on Extremes on Earth, which differentiates between depth from the surface and depth below sea level, and also between an actual mine vs. ...


4

The point you are looking for is very likely located in a mine. You could check the list of deepest mines by depth below ground, and then find and subtract the surface elevation for each. (This still assumes humans can go to the deepest points of these mines, which may or may not be correct.)


15

If your volunteer is a very small person, maximum shoulder width of 23 cm/9 inches, then the answer is 12,262 metres (40,230 feet) deep in the Kola superdeep borehole in Russia. I can't find the "height above sealevel of the start" to subtract from total depth of borehole, sorry. Best I can find is 230 metres above sea level. They probably won'...


31

I assume you are asking the deepest structure of any sort that exists. Here is an infographic : Source : https://alansfactoryoutlet.com/the-deepest-underground-structures-in-the-world/ One mystery undersea structure: Cuban Underwater City The Cuban Underwater City is another underwater structure that raises more questions than it answers. What appears to be ...


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