Don’t Be Prey review – invigorating tale of swimming entrepreneur aiming to avoid being shark food

Mark Sowerby battles bad feelings by tackling brutal channel crossings – the Oceans Seven – around the world The title of this invigorating documentary about open-water swimming seems at first to be a wry note-to-self regarding something competitors essentially have no control over: the possibility of becoming shark food. But, as practised by Australian waterman Mark Sowerby, it turns out to a surprisingly deep and empowering maxim about choosing to accept apprehensions and fears, and not being