The BBC did a program called 'Perisher' in the 80s, following up on interest after the Falklands War.
Very good, and on YouTube now: https://www.youtube.com/watch?v=dw2Q-_qswjQ
The Submarine Command Course (SMCC), previously known as the Commanding Officers Qualifying Course (COQC), and informally known as The Perisher because of its supposed low success rate, is a training course for naval officers preparing to take command of a submarine.
Created by the Royal Navy during World War I, the course was originally intended to address the high attrition rate of submarine commanders, as the previous method of handing down knowledge from officer to officer was prevented by wartime deaths. Following World War II, the Royal Netherlands Navy became involved in the course; the Dutch later partnered with the British to run the course, and following the British conversion to a fully nuclear submarine fleet, took over responsibility for running the course for diesel-electric submarines. Officers from other nations regularly participate.
The four-month course is run in four stages, the first and third involve learning ashore in simulators, while the second involves learning at sea. The fourth phase is the assessment, during which the candidates (of which the maximum is six) show their ability to command a submarine unaided during war-like conditions. The success rate for the SMCC is 70% and, on failing, candidates are prevented from serving on submarines in any capacity.