The five Perisher students take on a new challenge that is a crucial part of modern submarine operations – they will be sneaking around in dangerously shallow waters conducting reconnaissance missions and dropping sensors across the mouths of harbours.
The pressure ramps up even higher when a group of military top brass come onboard to gauge their progress, including two of Britain’s highest ranking submariners who waste no time throwing spanners into the works. For one student the pressure gets too much and five Perishers are reduced to four.
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