A Trident-II D5 SLBM launch in the Atlantic on 21 September 2025: analysis of footage from Puerto Rico (UPDATED)

frame stack of movie by SAC station Anasco, Puerto Rico click map to enlarge On 15 September 2025, Navigational Warnings appeared that pointed to an upcoming Trident-II D5 SLBM ( Submarine Launched Ballistic Missile ) unarmed test launch in the Atlantic between 17 and 22 September 2025 , from a submarine of either the US Navy or UK Royal Navy positioned some 400 km out of the coast of Florida (…