[russell_h]

It doesn’t sound to me like the boat actually sank. In the article it mentioned that they heard the rescue helicopter from within. Wouldn’t that imply that the pressure inside would be one atmosphere? Am I thinking about the physics of this wrong?

[madaxe_again]

The pressure of any trapped gas will be equivalent to the depth of the lowest level containing air - so if the bottom of your air bubble is a meter below sea level, your pressure will be 1.1 atm.

[duskwuff]

Sound does carry remarkably well through water - but you're right. The ship capsized, but the hull held enough air that it stayed afloat.

[shellfishgene]

Mostly, the weight of the boat pulling down would compress the air bubble a bit, probably not very much though.

[BurningFrog]

It was floating upside down.

There is a picture towards the end of the story.