Nuclear Sub Back On Patrol After £350m Refit

One of Britain's 15,000-ton nuclear submarines has returned to roam the seas as part of the UK's ultimate defence deterrent after a £350m refit. HMS Vengeance - equipped with Trident missiles carrying nuclear warheads - was towed out of Plymouth's Devonport dockyard after a four-year project involving more than two million man-hours. Its "deep maintenance period" included replacing the nuclear reactor core that generates its energy, as well as improving missile launch equipment and compute