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2026-09-19 #1 (lemmy.nz)

https://www.thefarside.com/2026/09/19/1

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[-] MajorMajormajormajor@lemmy.ca 10 points 2 days ago* (last edited 2 days ago)

Depends on how deep the person is, but since they're scuba diving in somewhat shallow waters (no wet suit, at the bottom but can see, etc.) not a terribly high amount.

If we assume 50 metre depth and 1 metre diametre plug:

p=ρ×g×h+p0 = 1022 kg/m3(9.8m/s2)(50m)+101kPa = 602 kPa or 87 psi for you Americans.

Area plug = πr2 = π(0.5m)2 = 0.785 m2

F = PA = 602 kPa x 0.785m2 = 472.6 kN or 106 238 lbf

So, far above what a person could pull, but not absurd amounts considering the sizes involved.

Edit: fucked up my units and force formula, whoopsie.

[-] psud@aussie.zone 3 points 1 day ago

It also depends on what's on the other side. It might not be vacuum, though whatever it wouldn't likely be in the hundreds of kilonewtons

[-] danc4498@lemmy.world 5 points 2 days ago

If I'm ever in this situation, I'll bring some friends.

[-] bumblefumble@feddit.dk 3 points 2 days ago* (last edited 2 days ago)

You mean kN / lbf for the final answer.

[-] MajorMajormajormajor@lemmy.ca 2 points 2 days ago

You're absolutely correct, good eye.

this post was submitted on 19 Sep 2026
140 points (100.0% liked)

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