Children (and children-at-heart) in the London area will be in for a treat when the ArcelorMittal Orbit reopens this summer. The 375-foot structure was originally designed by artist Anish Kapoor for the 2012 Olympic games, and now Time Out London reports that work has officially begun to transform it into the world's longest tube slide.

The ArcelorMittal Orbit is the tallest sculpture in the UK, and its tangled, looping design resembles a giant helter-skelter. And while visitors to Queen Elizabeth Olympic Park could previously take a lift to the top of the tower, they always had to go down the same way they came, or walk down the 455 steps. Then, last summer, it was announced that the art piece would be repurposed into a slide.

Construction on the project recently began, and the attraction is set to open early this summer. The 584-foot tunnel slide will wrap around the structure 12 times and send riders sliding at speeds of up to 15 miles per hour. Thrill-seekers will be able to purchase tickets for £5 in the next few weeks.

[h/t Time Out London]