Zip World London at the ArcelorMittal Orbit Helix- The World’s Longest and Tallest Tunnel Slide | Outdoor Activities & Adventures | Virgin Experience Days / Voucher Gift Virgin Experience Days For Couples/Him/Her/Mum/Dad/Boyfriend/Girlfriend/Wife/Husband/Partner/Family Things To Do | Get ready for your heart to race with Zip World London Helix - The World’s Longest and Tallest Tunnel Slide. Hop aboard the lift and ascend 76 metres to the lower viewing platform, where Helix awaits. Collect your mat and enjoy the stunning panoramic views of London around you. Then it’s showtime! Get settled on your mat and off you go. You’ll reach speeds of 15 mph as you descend the 178 metre Helix tunnel slide, looping around the ArcelorMittal Orbit 12 times. On your way down, catch glimpses of Queen Elizabeth Olympic Park, which you can explore further after your adventure. | London - Zip World