Longest double helix structure

According to Official Guinness Records,

The largest double helix structure is 68.5 m (224 ft 8 in) long and was achieved by Sterling Cathman (New Zealand) in Nelson, New Zealand, on 10 July 2018.The record attempt was part of an educational project.

For a complete list of 2018 records, please visit 2018 Guinness Records in New Zealand.

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Other New Zealand records that might interest you:

• Fastest round of golf (fourball)
• Longest static cycling class
• Largest collection of ties (Grabatology)
• Largest human image of a bicycle
• Most Rubik's Cubes solved while running a marathon