Best advice I could give is.. Forget what others say. On your first few deep dive stick to the rule of thirds. No one knows how they will react to the dive. You may breath a lot more do to excitement, scared what ever. After a few deeper dives you can figure out your own air consumption rate and dive your numbers. Remember also to communicate to your dive buddy and visa versa... first one to 2000 PSI calls the dive.. Dive Safe...