BBC 1 Northern Ireland have made a Documentary on the Royal Navy's submarine HMS sovereign. From the clips tey showed it would appear that they are following the Irish members of crew. Might be interesting

Officer and Commander
Wed 15 Nov, 10:45 pm - 11:15 pm 30mins
Britain's oldest nuclear submarine, HMS Sovereign, is about to be deployed on her final, secret mission.
For her Captain, Commander Steve Aiken OBE, from Northern Ireland it will his last sea-going tour of duty. This series follows them through the last year of their operational life from training and emergencies, to problems that threaten to scupper the entire project.
Wed 15 Nov, 10:45 pm - 11:15 pm 30mins
Britain's oldest nuclear submarine, HMS Sovereign, is about to be deployed on her final, secret mission.
For her Captain, Commander Steve Aiken OBE, from Northern Ireland it will his last sea-going tour of duty. This series follows them through the last year of their operational life from training and emergencies, to problems that threaten to scupper the entire project.
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