AMBUSH Commissions – the Fleet Submarine AMBUSH has commissioned as a warship and formally joins the Fleet having completed a series of successful trials.   Built by BAE Systems at Barrow the AMBUSH is the second of the Silent Service’s new hunter killer submarines the “boat” was “launched” at the end of 2010 and arrived on the Clyde in September 2012.    The AMBUSH is now undergoing a maintenance period before returning to sea in the spring to resume trials and training ahead of entering operational service.