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2500 meters deeper than sea level
A cylinder with a radius of 6 meters and a height of 10.5 meters has a surface area of 622.04m2
A cylinder with a height of 20 meters and a diameter of 10 meters has a surface area of 785.4m2
A cylinder with a height of 10 meters and diameter of 4 meters has a surface area of 150.8m2
A cylinder that has a diameter of 10 meters and a height of 3 meters has a surface area of 251.33m2
There is no data regarding the average depth of all dives of all divers. But sport divers typically dive to between 20 and 40 meters on most dives.
The surface area of the pond is measured in square meters.
2500 meters deeper than sea level
The curved surface area is 502.65m2
The circumference of that cylinder would be 31.4156 meters, and with a height of 4 meters, the outside surface of the sides would be 125.66 square meters. Does a cylinder have both an inside and outside surface? There is no thickness at all to the sides. Maybe it needs to be doubled, to be 251.32 square meters so we get both inside and outside surface, but I think not. A cylindrical *prism* would have a top and bottom, each having a surface of 78.54 square meters, for a total of 282.74 square meters.
Nothing other than training. Technical diver do it all the time, but recreational divers are limited by either air or nitrox which is narcotic at 40 meters (131 feet) and a very short time limit where technical divers can be trained in using helium as well as how to perform decompression stops.
Surface area = 4*pi*22 = 50.26548246 or about 50 square meters