Thunder Dolphin (サンダードルフィン) is a steel roller coaster at the Tokyo Dome City Attractions amusement park, which is part of Tokyo Dome City in Tokyo, Japan. The ride was designed and constructed by Intamin. At 80 metres (262.5 ft) tall, Thunder Dolphin is one of the tallest continuous circuit roller coasters in the world, currently ranked number 11. Following an incident in which a 25 centimetres (9.8 in) long bolt fell from the ride while in motion on 5 December 2010, injuring a 9-year-old visitor, operation of the ride was suspended until 1 August 2013, when the ride reopened.
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