Without a second\'s hesitation, technicians Stephen Watkins and Mark Donovan step off a bobbing boat on to a ladder hanging above the deathly chilled sea. They are wearing bright orange immersion suits – the best hope of survival if you fall into the water – as they make their way up the bulbous yellow structure that joins a soaring wind turbine to its foundations beneath the waves. Two hundred years ago, British engineering bestrode the waves. The easy way the technicians climb this maritime tower makes me think of sailors in Nelson\'s navy, at home in a sailing ship\'s rigging. Once on a narrow platform high overhead, they get ready to winch up a hefty sack of tools. Non-crew members aboard are encouraged to move to the back of the boat in case the pack falls on us. Other hazards include having a crab dropped on you by a bird – there are bits of crustacean spattered across the boat\'s windscreen. Huge colonies of barnacles grow on the structures underwater, and plentiful sealife attracts plenty of birds. When they have their tools, the engineers enter the white tapered tower bearing a turbine that rises above the waves to a height of up to 115 metres. That\'s just a number in the brochure of Vattenfall, the Swedish energy company that built and runs the Thanet offshore windfarm, but looking straight up from the boat, I feel every metre bearing down on me. There\'s no trace of the seasickness the technicians warned of, but a twinge of vertigo just contemplating the height of that metal pinnacle directly above; its three blades, stilled for now, like stupendous scimitars wielded by a giant. If Don Quixote were alive today, he would get water skis and fight a windfarm. Plenty of modern Quixotes are tilting at these science fiction windmills. Both on- and offshore, the white simplicity of the turbines attracts enraged complaints. Even though this Thanet field is only just visible from shore, local critics called it an eyesore when it was completed. With many Tory MPs now turning against Britain\'s wind energy programme, scepticism is rising like the four-metre swell that I am told is the cut-off point for maintenance work on the turbines – but out here, the rage against wind energy seems strange and distant. The towers that rise so slenderly from the sparkling icy sea look from this boat like monuments to optimism, common sense and human daring. As if to confirm this, the engineers phone as we pull away from their tower and minutes later, one man appears on top of the turbine housing, up there in the sky miles from shore, for his photograph. The structures themselves have the panache of Thomas Telford\'s 1826 suspension bridge across the Menai Straits, or Isambard Kingdom Brunel\'s Great Britain, launched in 1843 and the world\'s first propeller-driven ocean-going iron ship. When we think of such triumphs of the Industrial Revolution and Britain\'s nautical past, it tends to be with nostalgia, and a sense of decline. On the wharf at Ramsgate, abandoned ferry gangplanks exude a sense of decay. As we wait for our boat, two forklift trucks attempt, and fail, to shift a giant rusty anchor that looks like it could have come from the Great Britain itself.