This Stratford structure is hiding a rather hefty secret in the form of the longest and tallest tunnel slide in the world.
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World's longest and tallest tunnel slide set to re-open in UK city after £2.6m makeover
Thrillseekers are anticipating the re-opening of the world's longest and tallest tunnel slide. Helix is 76m high and and 178m long and is located on the iconic ArcelorMittal Orbit sculpture in Queen ...
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