WTF? How is this even possible?

🤷Maybe I was just high or had one too many beers, but something isn't adding up here.

I’m watching this movie—one of those new, modern ones. There are people on a submarine. They walk into some kind of chamber filled with water (on the floor), suit up in diving gear, and then jump right in. Suddenly, they aren't really "in" the submarine anymore; they're just out there diving...
how exactly does that work??? We're talking about a sub at a mile deep, and they just step out, yet not a single drop of water leaked into the rest of the vessel. Is it some kind of vacuum-sealed room or what the hell?😲

I mean, basic principle: for something to get in, something else has to get out. Since the opening is facing downward, air can't escape, which means water isn't going anywhere either. The only tricky part is the pressure buildup inside the chamber—that really depends on how deep you are. It’s the exact same logic as when you flip a glass upside down and submerge it in a pool 😉

Good grief, it’s not vacuum-sealed; it’s under pressure.😁

When you compress air like that, the composition actually shifts—high-pressure oxygen becomes toxic to humans.
And was it really a mile down? Most submarines don't even go much deeper than a few hundred meters.

Look, guys, I’ll be the first to admit—I don't know the first thing about vacuums or high-level chemistry.

Alright, maybe it wasn't exactly at the one-mile mark, but we're definitely in the ballpark (I circled 😁).

And even if we're talking about being 50 feet out, the fact that water didn't get in... that just doesn't sit right with me. It feels off. Do you have a more specific definition for that?

It didn't go in because for water to enter, it would have to compress the air inside the chamber where the divers are. But they’ve packed that air in there so tightly that the internal pressure matches the ocean's pressure at that depth.

If the pressure inside the chamber was just 1 atmosphere, while the sub is sitting hundreds of feet down where the pressure is dozens of atmospheres (think 33 feet equals 1 atm), opening that hatch would let the ocean come rushing in. It wouldn't stop until the air was compressed enough to match the external pressure... and it would pack a massive punch. Since air is highly compressible, the sea would basically flood most of the chamber.

You clearly don't get physics for Dummies 😬

placidjackal36 said:It wouldn't just rush in. To get inside, it would have to compress the air in the chamber where the divers are. But they've pumped enough air in there that the internal pressure matches the ocean pressure at that depth.

Look, if the chamber is sitting at 1 atmosphere, and the sub is down several hundred feet where the pressure is dozens of atmospheres (roughly 33 feet per atm), opening that hatch would let the ocean come crashing in. It would keep coming until the air was compressed enough to match the external pressure... which would be a lot of water. Air is highly compressible, so the sea would pretty much fill most of the space.

Ever heard of Mica?

Yeah. Writes just like her.

Alright, here’s how you do it. Grab a container of water—something with enough depth to work with. Then, take a glass, preferably a smaller one if you can find it. Flip the glass upside down and submerge it into the water. It works exactly the same way for a submarine 😉.

mistymarlin6 said:Look, here’s how you do it. Grab a container of water—make sure it isn't shallow. Then grab a glass, preferably a smaller one. Flip the glass upside down and submerge it into the water. It works exactly the same way for a submarine 😉.

But if you take that glass down to a depth of about 165 feet, it’s going to fill up with seawater because the ocean pressure is going to squeeze that air inside.
Basically, if you want to maintain the same volume as you descend, you have to pump in more air. Simple as that.

I mentioned in a previous post that the pressure was way too high. This was supposed to be just a little experiment... I mean, there's no way someone would actually attempt to dive down to 50 feet while holding nothing but a glass 😬

That’s not even my concern. Chuck Norris is actually my great-grandson.☕

mistymarlin6 said:I mentioned in an earlier post that the pressure was quite high. This was intended to be more of a thought experiment; surely nobody would attempt diving at 50 feet with just a single glass 😬

You could even manage at 30 feet using a standard balloon.
As the balloon sinks, its volume decreases.
It is the exact same principle.

I found that just as fascinating. Not even the concept itself, but more the fact that some guy actually held his breath and dove down to 500 meters. Or how he ended up imploding at 2,000 meters—it’s always the villains, isn't it? They always end up that way. Was it meant to be a joke or just dark comedy? 🤣

1. Total mutant, 100% pure sludge 😬
2. Could be. High pressure involved, but I seriously doubt it exploded. Logically, if anything happened, it would have imploded... hopefully. 🤔

Check out what happens when you're diving and you blow bubbles out of your mouth—the air just heads straight up.

Since the submarine has its opening at the bottom, the air isn't gonna fight gravity and head down to escape.
Plus, that trapped air actually acts like a barrier, stopping water from rushing in through the top.

mistymarlin6 said:...it's basically like when you flip a glass upside down and submerge it in water.😉

It's honestly like one of those middle school science experiments where they teach you that air is a physical substance and that matter takes up space.

The air occupies the space inside the sub, so there’s simply no room left for the water to move in.😁

EDIT: I used to be totally obsessed with this—specifically how subs worked—back when I was a kid before I even started learning actual physics.

^Oh, come on now😁. Just look at that first response😉

Physics is such a headache.
Take a glass and turn it upside down under water.

mistymarlin6 said:^^oh please😁. just check out the first reply 😉

so I was basically trying to break it down for everyone...
physics for Dummies 😁

Well, it appears that today is finally Friday, and the local crew is out there right now, diligently clearing away the debris and getting everything tidied up for the upcoming harvest ☕