Almost 30 minutes new breath holding record

Interesting perhaps but, breathing pure O2 for more than thirty minutes (Some sources state a whole hour)? How does that qualify for a breath holding record?

Sorry but it is a farcical exercise and pointless.
 
How does that qualify?

Because he held his breath underwater for 30 minutes.

As O2 is the key to this pre-breathing pure O2 prior to saturate your system with maximum O2 is allowed so not sure the issue with it.

A weightlifter trained with really heavy weights in preparation of lifting heavy weights. If he was somehow able to train on Jupiter then broke the record back on earth he still broke the earth record.

Long distance runners train at high altitude to improve performance in races at sea level.
 
It helps that it wasn't a combat situation.

Frogmen the world over still do need to take note of this just in case.

How long could he have held his breath had he been vigorously swimming to place a limpet mine on a hull?

Less than 15 minutes I would think.

Oxygen toxicity is also a possibility--there is such a thing as "shock lung" that was associated with the rise of oxygen bars.

Not for nothing did anaerobic life forms plunge below. Oxygen breathers like us--we are like alcoholics. Don't give one any more drink--he could die of DTs...but over time...it kills him.

It is why many take anti-oxidants.

On the subject
https://medicalxpress.com/news/2025-08-women-sea-aquatic-mammals.html
 
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