TALE OF THE TAPE VANGUARD DREADNOUGHT 87.4 megatons MAX DESTRUCTION POWER 65.5megatons 16 NUCLEAR MISSILE TUBES 12 £20bn COST AT TODAY'S PRICES £31-41bn 1986 CONSTRUCTION STARTED 2016 Steam turbines PROPULSION Electric 150m LENGTH 152m 15,900 tons DISPLACEMENT 17,200 tons 150 CREW 130