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As the divers were investigating the ocean, an unexpected earthquake struck.
T
I’m guessing that’s a pretty safe place to be during an earthquake.
S
Water transfers sound really well. I imagine it is terrifying despite the seeming safety.
I
It must hurt the sea life that uses echo location. Whales, dolphins etc.
O
It’s really loud and sounds like a tanker going over your head. The sand below you shifts like in the video. Overall isn’t too bad, just loud.
M
Until you get slammed against a rock or swept up in a tsunami
A
Except that the rocks have to displace the water around it, in which you are suspended in, and are almost as dense as, thus you’d be displaced also, so unless you’re like, 1cm from a rock, you’ll be fine. The tsunami part is only a concern, hours after the fact.
S
Maybe a dumb question, but if there ended up being a fissure in the ground or something, couldn’t you get sucked in by the water being moved into the gap as a result of the displaced ground?
A
Yes, that’d be a possibility.
K
Why are you being casual about that terrifying thought
A
You want terrifying? You should read up about “Delta-P”.
U
[Byford Dolphin](https://en.m.wikipedia.org/wiki/Byford_Dolphin)
Z
That’s terrifying.
U
Really great podcast about engineering disasters…with slides that goes over it. https://youtu.be/azThd0R7Bt0
A
Holy shit,that’s metal. I think I’ve seen a depiction of this in either Jojo’s or that Baki Anime lol terrifying stuff.
U
https://www.reddit.com/r/videos/comments/goaff/delta_p_in_alien_resurrection_whoaaaaa/
R
the chances or scuba near an epicenter is pretty slim.
H
…but never zero
R
The possibility is about the same as a fissure opening up and swallowing you right now.
M
Close enough to zero to not be something to ever be concerned with.
U
I don’t think earthquake fissures open large or fast enough to pull a diver in unless they were like literally on top of it. It’s more of a somewhat gradual thing and water is probably already saturating whatever area is weak enough to rupture like that. Unless the earthquake is particularly large and violent, I guess… I’m not a geologist or seismologist, though, just took a few geology courses.
K
I feel like it would be weird for them to happen shallow enough to where there could be divers nearby anyway.
U
Earthquakes can happen pretty much anywhere, though they’re more rare when they aren’t near a plate boundary. Depth doesn’t really matter, and regarding nearby divers, it’s entirely luck (or unlucky) based on whether someone’s diving in the area when one happens.
A
DELTA P!
M
How would you be displaced without physically touching the rock? (Serious question, not rhetorical) Is this the same reason bugs don’t splat on your car windshield?
S
i think what they are getting at is when the rock moves it pushes water, you are about as dense as the water so the water pushes you and the rock effectivly cant touch you.
B
A tsunami while out at sea, particularly close to the point of its origin, is almost unnoticeable. It’s just a low swell. It’s only when it gets to shallower water that the wave starts to build up. It’s also not displacing very much water at this point. The horizontal movement that would be imparted on the diver would be minimal. It wouldn’t carry them along with it, or sweep them up. You can think of it almost like a sound wave (or shockwave) underwater. The air (or water) isn’t actually moving very far. It’s just becoming compressed and passing that energy along to the air (water) molecules in front of it.
S
Not just being argumentative, those coral can be ***razor*** **sharp**. I think they’re fairly safe *except* those who are close to that shifting coral.
T
Nothing like the earth opening up like a filled sink while you sit nearby getting sucked in
M
I’d be terrified of some fissure opening up right below me and getting sucked in with the water that pours into it. I have no idea what the likelihood of that happening is, but if it’s greater than 0%, it’s already too high for me
B
Untill the tsunami hits.
Z
Tsunamis doesnt ”hit” in the ocean
M
They are pretty close to the surface, so I don’t think so.
M
My diving instructor told me he was diving when the tsunami hit Indonesia. He said it sounded like an oil tanker passing over head, and after they surfaced their boat was gone and the entire coast line was destroyed. Edit: to those saying its fake. He was a pretty genuine bloke i dont see why he would bullshit me. Having said that I’ve no way to verify.
Z
So the lesson here is to go diving when the shore starts to recede?
A
Now I’m genuinely curious if it’s enough of an early warning sign to reach deep water. I wonder how deep you’d have to go
Z
That’s a great question. Cause far enough down you won’t even notice the change, but also the receding water is fueling the tsunami, so it might not be that deep. If you can make it to the receding water, it’d carry you out pretty deep before it reaches the wave, so you could probably swim straight down till the current weakens Edit: Flip side, you make it there but dont make it low enough to escape before the wave is above you and the heavy currents start pulling you upward. Then before you reach shore you’re either Skyscraper high in a wall of water about to crash into the shore, or you’re falling from the breaking water to your death. Or you’re surfing the tsunami on your O² like an absolute chad
D
Third flip, the wave grinds you to paste on the sea floor
Z
Oooh, that’s fun. I didn’t think of any downward forces, but if you time it well enough, you could arc up, have the view of a lifetime, arc back down, and the momentum very well may send you to the bottom. If you don’t get smashed on the down or fall from going up, you’ll still end up having barometric trauma and will probably die before resurfacing
D
Damn, it is indeed fun!
G
Not a diver, but assuming you dove when the water was low, would the tsunami waves add a bunch of pressure once the arrived, would you feel that extra depth right away?
I
I always thought of underwater Tsunamis to suck humans and spin them up because it’s a roller like wave, like those jellyfish do in the ring bubbles from dolphins. But your explanation makes a lot of sense.
Z
You’re not wrong either, it just depends on how close you are. It doesn’t suck up the whole ocean, and a lot of the water came from in front of it not below
A
I mean maybe if you are in a boat that is unmoored and you notice, but I don’t think diving is the way to go there. You’d want to get past the wave before it gets too tall. Setting up for a dive would take a while and you’d need to be in a place deep enough to not be wildly affected by the tsunami, which might actually by antithetical to a tsunami being close enough to draw the water awaym
S
You have to be pretty far out, otherwise you’ll just be sucked into land
Z
You absolutely would. I’d imagine you’d have to react almost instantly, gear up, hop in a jeep, and drive that thing with the doors off till it starts sinking. You’d probably be deep enough to ride the rip tide at that point
O
Then what? Where did they go? Can’t go inland doesn’t all the water come sucking everything back out into the ocean?
I
How far out were they? That sounds like a pure nightmare 😳
A
Sounds more like bullshit honestly.
G
That sounds fake
A
That sounds terrifying
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