It was brilliant to raise the White Ensign. We’ve all worked really hard to get to this point and to be part of the handover has been memorable

AB George Sherwin, Ambush Sonar Specialist

When she left Barrow-in-Furness Ambush was flying the Blue Ensign to mark her out as a vessel undergoing sea trials.

Sea trials test the boat's systems to their limits, taking the boat to her deep diving depth to ensure that she is as safe and capable, in addition to other important trials.

The planned fleet of seven Astute Class submarines are being built to replace the current fleet of Trafalgar Class submarines and are arguably one of the advanced submarines in the world today.

The 7,400 tonne Astute Class is quieter than previous submarines, and can operate covertly and remain undetected despite being larger than the Royal Navy’s current Trafalgar Class submarines.

Sonar specialist AB George Sherwin had the privilege of raising the Ensign for the first time.

He said, “It was brilliant to raise the White Ensign.  We’ve all worked really hard to get to this point and to be part of the handover has been memorable.”

Ambush will continue with further trials prior to her formal commissioning, when she will become an HMS, and enter operational service.