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3w ago

HMS Agamemnon Completes First Submerged Trim Dive in Barrow

The in-dock test clears the newly commissioned submarine for sea trials ahead of joining the fleet at HMNB Clyde.

HMS Agamemnon Trim-Dive
BAE Systems picture from the first diving test of the future HMS Agamemnon
HMS Agamemnon undertaking a trim dive outside the Devonshire Dock Hall submarine facility. Credit: BAE Systems
Image

Overview

  • HMS Agamemnon successfully conducted a three-day trim dive in Devonshire Dock at BAE Systems’ Barrow-in-Furness yard, its first full submergence.
  • The trials verified stability, buoyancy, watertight integrity, internal weight balance, and calibration of sensors and ballast systems.
  • Testing was carried out by BAE Systems and the ship’s crew with oversight from the Submarine Delivery Agency and Ministry of Defence naval architects.
  • The boat was commissioned by King Charles III on September 22, 2025, and is the sixth of seven 97-metre, 7,400-tonne Astute-class submarines.
  • BAE Systems reports its Barrow submarines workforce has grown to about 15,000, as it progresses Astute production, builds four Dreadnought-class SSBNs, and advances AUKUS design work.