Just ´crank up the pO2 for those dives
I've had 28% mixes to be able to go a little deeper and have some extra time. Ideally you'd want a bigger tank too when you're spending time at 30+.
Sometimes air is the only option. You easily run into deco if you're not very attentative to your computer/watch. Can be challenging when you have 30 sharks in front of you.

I've had 28% mixes to be able to go a little deeper and have some extra time. Ideally you'd want a bigger tank too when you're spending time at 30+.
Sometimes air is the only option. You easily run into deco if you're not very attentative to your computer/watch. Can be challenging when you have 30 sharks in front of you.