The latest state-of-the-art hunter-killer submarine set to join the Royal Navy, HMS Ambush, has successfully completed her first dive.
The estimated £1.2billion boat, the second in the Astute Class of submarine, is due to go on sea trials early next year and the dive - known by engineers as a 'trim and inclining experiment' is seen an important milestone.
The dive proves the boat's safety and stability in the water and measures the submarine's performance.
The maiden dive of the submarine, being built by BAE Systems, took place at Barrow-in-Furness docks, Cumbria over two days and involved more than 70 people including BAE Systems' engineers, Ministry of Defence personnel and Royal Navy Ship's Staff.
