Although this is being promoted as an RN problem its actually bigger than that as the T11 fired was selected from the joint USN/RN stock of missiles.
If the first stage didn't fire then it was just airborne for a few seconds after the compressed air ejection, hence flopping back into the sea near the sub.
The Sun reported that it was understood that had the firing taken place on a real mission rather than under test conditions, it would have been successful'
Kafir For You
@Kafir_For_You
The UK Trident firing exercise failed as missile fell into the ocean a few meters from the British nuclear submarine that launched it, The Sun reported. "It left the submarine but just fell, right next to them," The Sun wrote, quoting a source inn know as saying.
The nuclear submarine crew were executing the "doomsday" drill and the Trident 2 missile was launched. But its first stage failed to ignite and the 58-ton missile, equipped with dummy warheads, fell into the ocean and sank.
It's the second consecutive failed launch after a misfire in 2016 and the cost of a single Trident missile is up to £17 million ($21 million).
The British Ministry of Defense acknowledged there was an "anomaly" during the drill, but stated that UK nuclear deterrent remained "effective."
SputnikInt
AJ Occams Razor
@vega070
Northrop Grumman manufactures the rocket motors for all three stages of the Trident missile. This is a US industry failure as much as it is a UK problem as they are responsible for selecting the missile and preparing it for the test. The testing range is also managed by the US
OSINTdefender
@sentdefender
A UGM-133 Trident II Submarine-Launched Ballistic Missile Test at the End of January aboard the HMS Vanguard (S28) reportedly Failed for the Second Time in a Row since 2016, with the Missile only remaining Airborne for roughly a Minute after the First Stage Boosters did not Ignite causing the Missile to fall into the Ocean off the Coast of Florida;
Submarine-Launched Ballistic Missiles from the British Royal Navy’s Vanguard-Class Submarines are the only Form of Nuclear Deterrence that is kept by the United Kingdom, meaning the Failure of both of these Tests is a Significant National Security Problem.