Title: Last Breath
Director: Alex Parkinson, Richard Da Costa
Cast: Duncan Allcock, Kjetil Ove Alvestad, Stuart Anderson, Glenn Brunskill, Michal Cichorski, Filippo De Filippi, Craig Frederick
Plot: A commercial diver is stranded on the seabed with only five minutes of oxygen supply, but with no chance of rescue for more than 30 minutes. With access to amazing archive, this is the true story of one man’s impossible fight for survival.
Simple but gripping documentary, on UK Netflix now. Excellent example of "the Ticking Clock" device.