Today, we are going to prove that Robloxians can survive pressure that would kill us! (Also, this is rushed, so expect informalities to pop up)
First of all, we use the formula for the pressure of a column of fluid. P = ρ g h + P0 .
ρ of Roblox's only fluid is water, which has a density of 1000 kg/m3 (https://devforum.roblox.com/t/is-there-a-way-to-get-robloxs-terrain-water-density/1123672)
g of Roblox is 54.936 m/s2
We can assume that P0 is equal to the atmospheric pressure on Earth (101,325 pascals).
The formula then is: P = 54936 h + 101325.
In the shortest column of water (4 studs = 1.12 meters ), the pressure at the bottom is 162.8 kilopascals. A Robloxian's head (assuming R6) will be under 25.5 kilonewtons of force here.
In the longest column of water (16,384 studs = 4,590 meters), the pressure at the bottom is 252.12 megapascals. A Robloxian's head will be under 3.95×107 newtons of force here.
So there: I proved that Robloxians have superpowers.