Although it shouldn’t have happened, on a dive i fail to watch my spg and run out of air. if my buddy is close by, my best option is to another option is to if i’m in shallow water and the surface is closer than my buddy.
a ascend using my buddy's alternate air source / make a controlled emergency swimming ascent
b ascend using my buddy's alternate air source / make an buoyant emergency ascent
c make a normal ascent / ascend using my buddy's alternate air source
d make a controlled emergency swimming ascent / make a normal ascent