Last Breath is a perfectly serviceable but oddly lifeless dramatisation of a harrowing real-life diving incident. Alex Parkinson, who also co-directed the documentary version, brings attention to detail but fails to convey any sense of jeopardy or urgency. Every expected beat is dutifully ticked off, from the futility of the mission to the swelling score, but the tension is sorely lacking. Despite the cast giving it a decent go, the whole thing feels inert, flatly directed and choppily edited. Functional, but far from gripping.