The Royal Navy actually has four Vanguard class submarines: Vanguard (S28), Victorious (S29), Vigilant (S30) and Vengeance (S31).
The dramatic destruction of the fictional trawler Mhairi Finnea in the series has been likened to the sinking of the FV Antares by Royal Navy’s nuclear-powered submarine HMS Trenchant in the Firth of Clyde in 1990.
Most people including yours truly have never been on a submarine and the producers have come under fire from those who apparently have because of its fanciful sets and action.
But it makes for gripping action and this is of course television, where anything is possible.
The producers have not revealed whether a second season is coming, but it’s unlikely to involve a submarine — that ship has sailed.
Vigil will have you coming back for more and can be seen on Binge or Foxtel NOW.