The UK's newest Astute-class submarine, Agamemnon, has successfully submerged for the first time at BAE Systems in Barrow, Cumbria.
The Royal Navy crew achieved this major milestone as part of HMS Agamemnon's 'trim dive', a three-day period of testing in the town's Devonshire Dock to prove the 7,400-tonne, 97-metre-long attack vessel's stability and safety.
This trim dive is the culmination of months of hard work.
The process comes shortly after King Charles III officially commissioned the Astute class submarine into the Royal Navy, and is a key moment in the lead up to its departure from Barrow to join her sister boats in the fleet, based at His Majesty's Naval Base, Clyde.
Author's summary: Agamemnon submarine successfully dives.