A Trident nuclear missile misfired and crashed into the ocean near the submarine that launched it during a test last month, Report informs, citing The Telegraph.

It is the second misfire in a row, with a test launch of a Trident missile by the Royal Navy off the coast of the US in June 2016 also reported to have been a failure.

The missile’s first-stage boosters did not ignite during a test launch by HMS Vanguard on January 30, and it fell into the ocean and sank, the Sun reported.

An anonymous source quoted by The Sun said: “It left the submarine, but it just went plop, right next to them.”

The Ministry of Defence confirmed an “anomaly” that was “event specific” occurred during the test off the coast of Florida, but refused to provide further information on the grounds of national security.