Misfires were the cause of this: the British nuclear submarine missile test failed

According to the information, the error was due to the fact that it was a test recording. Nuclear deterrence, the cornerstone of UK defence, remains “safe and effective”. As the Sun newspaper reported, the rocket was launched into the air as planned using compressed gas in the launch tube. But then the first stage boosters failed to ignite and the Trident, which was equipped with dummy warheads, plunged into the sea and sank. Broadcaster Sky News quoted a source as saying the launch would have been successful if it had actually been carried out with a nuclear warhead.

Already second failed test
Sky News called it an “embarrassing setback” for the Royal Navy. It was the second failed test of a Trident nuclear missile; an error had already occurred in 2016. The Sun newspaper reported that both Defense Secretary Grant Shapps and Navy Commander Ben Key were on board the Vanguard to observe the test. The opposition was concerned.

Vanguard class submarines will be replaced soon
The submarine is one of four of the so-called Vanguard class that have been in service since the 1990s. They are planned to be replaced by larger Dreadnought-class submarines in the 2030s. According to the House of Commons Library, between 31 and 41 billion pounds (36 to 48 billion euros) are available for this.