As Gingejbee indicates, the TV drama is entirely fictional. However it's quite likely that the writer had the FV Antares incident in mind when devising the plot (and it might also be what you're thinking of, Carole):
https://britishseafishing.co.uk/the-sinking-of-fv-antares/
Enjoyed it - impressive sets, built in studios in Dumbarton. The only thing that I found unbelievable was the detective played by Rose Leslie telling the dead submariner's girlfriend that he had died of a heroin overdose. Surely that would be confidential information, and she would know it would get her into trouble as it would then be leaked to the press.
obviously they borrow
In his first smash hit series Cardiac Arrest - Lamorna Osbournes case report featured ( BMJ 1979) she didnt complain.
If you can stand a few hour of Chernobyl, the reactor ills follow quite closely - Chernobyl when they SCRAM'd it went critical just like they had been er warned previously. - graphite ( crap moderator ) displaced water good moderator and it goes out of control