This is another BBC attempt at high drama that fails to maintain any realistic foundation.
One minute a sailor is going to commit suicide with a handgun he aquired from the arsenal....lock him up and keep a close eye on him I would.....no, 😳 then he's wandering about on other duties.
Police doing suspect interviews on a park bench in town.
The submarine is sabotaged so many times by the weakest of means it would only take a flat tyre to bring it to its knees.
If you take away the integrity of honest scrutiny then you will love it.
If you like your drama realistic, then you will not.