- West Country (W)
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The Royal Navy submarine HMS Tireless has been stood down in its search for the missing plane.
Working alongside the survey ship HMS Echo, Tireless played an important role in the hunt for the black box signal by using her specialist sonar capabilities.
But, with the Australian command assessing that there is no prospect of further acoustic detections associated with the aircraft black boxes, the Plymouth-based submarine is no longer required.
The Plymouth based Royal Navy submarine HMS Tireless has arrived in the southern Indian Ocean to help in the search for missing Malaysia Airlines flight MH370.