A BARROW-built submarine is nearly ready to get to work after sea trials.

HMS Anson, the Royal Navy's newest and most advanced hunter-killer submarine, is now on the verge of joining the operational cycle following intensive tests in the Atlantic.

The fifth of the Royal Navy’s Astute-class boats produced by BAE, it underwent trials off the east coast of the United States and in the Caribbean Sea, rigorously testing her systems and weaponry.

The Astute-class nuclear-powered submarines are the largest and most advanced attack submarines ever operated by the navy, officials say, capable of launching long-range Tomahawk missiles to accurately hit land targets and lethal Spearfish torpedoes to defeat enemy submarines.

Anson and her operational sisters previously constructed in Barrow – Astute, Ambush, Artful and Audacious – are capable of circumnavigating the globe while submerged, producing their own oxygen and drinking water to sustain the crews on arduous and lengthy deployments.

The Mail: HMS Anson submariners enjoy the night sky

Therefore, this advanced submarine, which left the shipyard in Barrow in February last year – needs extremely thorough trials and tests before joining her sisters on operations.

Anson spent time in waters off the UK coast and then sailed further north of Scotland to test her weapons systems with successful firings of both Spearfish and Tomahawk test missiles.

The tests and trials intensified into the Atlantic as Anson headed to the Atlantic Undersea Test and Evaluation Center (AUTEC) in the waters around the Bahamas.

 The ranges off Andros Island – south-west of Nassau – are centred on a natural phenomenon, the Tongue of the Ocean, a huge deep-water bowl carved out of coral reef.

The Mail: Crew on board HMS Anson during the sea trials

The bowl is 20 miles wide, 150 miles long, some 6,000ft deep in places and crammed with sensors and hydrophones to record reams of data on how well a submarine, torpedo or sonar is performing.

Tests at AUTEC are crucial to Anson’s future operations, ensuring she can hunt adversary submarines without detection.

The sea trials also gave the crew the chance to get ashore to Andros Island.

“The opportunity for the majority of the Ship's Company to get spend a few days on Andros was fantastic,” a submariner said.

“This afforded us a few days of rest from the sea trials we were conducting and allowed us to spend time on the beach in the sun relaxing and playing volleyball with base personnel.”

Before heading home, she completed a further round of system testing.