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” There are airbags that can be inflated, in order to lift the vessel to the surface.”

Uh, how???? The pressure at 12,500 feet deep is 370 atmospheres. Exactly WHERE are they going to store air in a tank of any kind at higher than 370 atmospheres (that’s 5,550 PSI) in sufficient quantities to fill airbags to give them enough lift to raise their potentially mired sub?

There are tanks capable of holding air or a gas at 370 bar (Atmospheres), but assuming it’s a 100 Cubic foot tank then opening the valve at the bottom into an airbag 12,500 feet down, does NOTHING! The differential pressure is the same inside the tank as it is outside. It might burp… They’d be better off using that air to breathe for longer, waiting to be found had they not imploded.

Comparative Example to Just 1% of The Depth and Pressure
the deeper you go, the smaller the bubble becomes. At the depth of Titanic,
it’s likely any intended lifting gas would enter solution with the water instantly!

Given the info conveyed:

Missing Sub: What the mainstream media are not asking! | SY News Ep223
5:38 / 14:18 According to 1 report . . .

We may expect, that the inflatable airbags would be used at a depth where they would function.

I did see four large orange air bags inflated, used with one of the OceanGate submersibles, but IIRC, the bags might have been attached to the large sea sled - or whatever they call the platform onto which the submersible returns. So, I am not sure about the "1 report" and the fellow conveying the info did seem to emphasize just a wee bit, "1 report."

See CBS News video (h/t spirited irish):

https://www.youtube.com/watch?v=-TowaxZDUnY

4:20 into 10:01 - “7 Redundant systems for returning to the surface”

4:49 - 5:03 - Air Bladder and 10,000 PSI Air Tank