Construction has begun on the new slide by BBlur Architecture which will wrap around Anish Kapoor’s ArcelorMittal Orbit sculpture in the Olympic Park, Stratford
The first piece was lifted into place by a team of abseilers earlier this week.
The slide, which will be the longest enclosed helter-skelter in the world, is expected to cost £3.5 million – more than three times its original estimate.
The 800mm diameter stainless steel tube is set to weave its way around the Orbit 12 times and will be 178 metres long.
Sponsored by ArcelorMittal, the £19 million Orbit was designed by artist Anish Kapoor, engineer Cecil Balmond and Ushida Findlay Architects as an observation deck for the 2012 games.
The addition to the East London attraction will open in the summer and is expected to cost £5 a go.