How does Boyles Law explain how a submarine works?

Can someone explain a little bit about Boyles Law and how it's important to how a sub works?

Thanks a bunch!

As depth of submarine increases the pressure outside wants to push air inside into smaller volumne according to Boyle's law. Submarine hull at some point will surrender to this force.

I'm not sure about the submarine but if it helps here is some info on Boyle's law.

Boyle's Law P1V1=P2V2 If gas is at a constant temperature, pressure and volume are inversely proportionate and have a constant product. Basically, It is the relationship between volume & pressure. As 1 increases the other decreases.

Hopefully this helps a little. Sorry I don't have an answer