WATCH: Royal Navy submarine fires Trident II Nuclear ☢️ Missile 🇬🇧🏴‍☠️🇬🇧 HMS Vigilant is one of four Vanguard Class submarines that maintain the UK’s nuclear deterrent and this firing, the first in three years, confirms the credibility of the deterrent. The Vanguard submarines will be replaced from 2028 by the Successor which is currently being designed by British companies. The Trident missile is a submarine-launched ballistic missile equipped with multiple independently targetable reentry