Primarily coming from a background in television and documentary filmmaking, for his feature-length effort Last Breath, director/co-writer Alex Parkinson adapts one of his docs of the same name that chronicled this same story of a stranded and submerged saturation diver.  During some underwater pipeline maintenance, a disruption leads to a snagged, and ultimately severed, oxygen supply for the diver.  As his team works to save him, the diver tries to conserve the last of his…