"Because the pressure will cause the heart to explode."
Well, no (the heart cannot "explode" anyways, rupture yes, but I'll leave it at that for now).
The main problem is the pressure differential on the surface compaired to the lungs which are submerged. At one meter's depth the water adds 0,1 bar of pressure to the atmospheres 1 bar. This means that the lungs which are compressed to 1,1 bar (1 bar ATM and 0,1 bar of water) must overcome the pressure, making breathing impossible since the air cannot be drawn into the lungs.
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One cubic meter cannot be "converted" to a square measure unless we know how "deep" it is being spread. For example, if it is one meter deep, then it would cover one square meter; but if it is two meters deep, then it would cover half that area. If it were, say, 1 cm deep, then it could cover a million square centimeters (100 x 100 x 100).
I'm assuming you mean one meter deep with a one square meter footprint. The answer is 1*1*1=1m^3 = one cubic meter. Actually, that is how much dirt was taken out to make the hole. There should be no dirt in the hole, otherwise it wouldn't be a hole.
A 28 meter square is 28 times 28 meters or 784 square meters. If it is one tenth of a meter (10 cm) deep, it has a volume of 78.4 cubic metersIf you mean 28 square meters (like a pool 4 meters by 7 meters) then the volume one tenth of a meter deep is 2.8 cubic meters.
It all depends on how deep the hole it's in is. It could be just over a meter, or it could be deeper than 5 feet.
150 millimetres = 0.150 meter To get area, divide volume by thickness 1/0.150 = 6.66 square metres