They’re not bubbles. They’re small solid particles, most likely bits of water ice.

As the astronauts exit the ISS through the airlock, the air in it is vented to space. As the air expands, it cools (look up “adiabatic expansion”). The water vapor in the air freezes into small ice crystals. These crystals then slowly sublimate, i.e., they turn directly into water vapor, so they do not contribute to the space debris problem.

Here’s an example of humidity freezing into ice crystals as air is vented to (near) vacuum. It occurred during Felix Baumgartner’s jump from the stratosphere. As he opens the hatch, notice the cloud of ice crystals going out the top of the door. Even though the cabin was already vented nearly to ambient pressure, enough air remained inside for the water vapor in it to freeze instantly into enough ice crystals for the camera to see.

@Green Knight

OK but why do the apparent bubbles go straight up like air bubbles rising in water?

If frozen ice or whatever would not go straight up

There is no gravity in space did you know!

Right so they should just float or go in whatever direction there momentum is

Not straight up like air bubbles

Basically yes

So either they are faking it in the huge simulation pool

Or space is water

Or GRAVITY IS OBSOLETE IN SPACE

Also have you heard about that astronaut on the ISS who almost drowned?

And now they all have snorkels

Hmm give me a link can you?

There is still a little bit of gravity at the iss but it is very little so stuff should still move towards earth

Yeah again no gravity in space would not make stuff go straight up as if rising in water

That would be reverse gravity not no gravity

There is no up and down in space

In no gravity it would just float in place

Exactly

That's why the bubbles going fast up is not consistent with zero g space

But consider with underwater

Yes pizza I'll find you a link

It's an absurd story

Depends where the person stands and speed of the object

Might be a leak in his drinking bag?

When he almost drowned?

Heard that could happen

Drowning is possible in space for many reasons

The other thing is he was supposed to be in space and his family got a call saying hurry he is in the hospital almost drowned

And the family was like wtf he's supposed to be on the ISS

So how did he get to the hospital

Link? NASA Has underwater testing facilities in Houston Which they send astronauts to swim with the water and do tests or whatever @Green Knight

its called the Neutral Buoyancy Laboratory

Yes many people suspect the ISS is faked in that laboratory

https://www.space.com/24835-spacesuit-water-leak-nasa-investigation.html

Can't find the story version I read before

"harrowing spacewalk on July 16, 2013, in which water flooded the spacesuit helmet of Italian astronaut Luca Parmitano"

If you read all of it it says it was a water leak was a clogged filter

That was because there was water in the suit and it happened to caused water to leak

Yea a water leak from a filter