I settled cross-legged onto cushions at a table that was secured to the blimp's hull on a metal arm and thus did not touch the gantry at all. The gantry itself was cordoned with the faint haze of a power screen that kept the temperature decent and the gusting wind to a pleasant breeze. Around me the hexagonal grating floor allowed me an almost uninterrupted view past the edge of the cushions to the sea a kilometre below. I shifted uneasily. Heights had never been my strong point.