The 5 low-on-air/out-of-air priorities can be easily remembered with the phrase "No Air Can Be Bad".
No = Normal ascent
Air = Alternate air source ascent
Can = Controlled emergency swimming ascent
Be = Buddy breath
Bad = Buoyant ascent
On all ascents, except Buoyant, you shouldn`t ascend faster than 60 feet per minute (or just go slower than your smallest bubble). On the Controlled emgergency swimming ascent, if you run out of air to exhale and you`re still not close to the surface, you may need to ascend quicker.