One of the Royal Navy's 'V' Class submarines returned home to HM Naval Base Clyde at Faslane this morning. As usual, the submarine, HMS VANGUARD, was escorted by a flotilla of small vessels with armed police and Royal Marines on board, as well as CONDOR, one the the MoD Police launches based on the Clyde. The four 'Vanguard' class boats, which are armed with Britain's nuclear deterrent, the Trident missile system, are all based at Faslane. They displace 15,900 tonnes when submerged, are 149.5 metres in length, with a Rolls Royce Pressurised Water reactor producing steam to drive two GEC turbines. These give her a quoted submerged speed of around 25 knots. Each vessel carries a crew of around 130.