Sand needed: 8*6*1.5 = 72 cubic feet
Two atmospheres is 67.8 feet of water.
78 feet
22.44 gallons for each inch of the water's depth.
72 feet is already linear as feet is linear so answer is 72
Twelve fathoms
1000 atmospheres is equivalent to approximately 15,000 feet of depth in water.
660 feet is the water proof depth.
It is 2250 cubic feet.
The water pressure at a depth of 300 feet would be approximately 130 psi. This calculation is based on the fact that water pressure increases by 0.433 psi for every foot of depth.
To cover 144 sq ft with soil to a depth of 6 inches, you would need 72 cubic feet of soil. This can be calculated by multiplying the area (144 sq ft) by the desired depth (6/12 ft) to get the volume in cubic feet.
35000 feet of altitude exerts more pressure on an object compared to 260 feet of water depth. This is because the pressure exerted by the atmosphere decreases as altitude increases, while the pressure exerted by water increases as depth increases.
Sand needed: 8*6*1.5 = 72 cubic feet
300 feet of sea water exerts a pressure of approximately 130 psi.
The depth of a quicksand pit can vary, but it is typically around 6-8 feet deep. This would be equivalent to approximately 72-96 inches in depth.
72 cubic feet
If that's where the water is. At that depth, it should be fairly good water, well filtered by the time it get to that depth.