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Keywords:London, o2, Roof, walk, view, views, walking, climb, climbing, millenium, done, Greenwich, arena, tensile, pylon, pylons, people, climbers, climbed, walkway, walkways, dock, docklands, dockland, viewing, platform, rope, tied, tie, roped, ropes, steel, cable, cables, high, up, blue, development, Thames, river, yellow, skin, canopy, tense, tower, towers, 02, visit, visitor, attraction, elevate, elevated, east