Scottish climber repeats Megatron

Hamish McArthur made the second ascent of Megatron V17 in Colorado's Eldorado Canyon in April 2025, completing the climb in just five sessions.

Megatron is extremely rare

Only three climbers have ever sent Megatron: Shawn Raboutou (first ascent in 2022), McArthur (April 2025), and Zach Galla (April 2026). It remains one of the world's hardest boulder problems.

Built on an existing classic

Megatron is a harder, extended version of Daniel Woods' Tron V14, established in 2017. It was the second V17 ever established in the United States.

Drew Ruana's brutal breakdown

American climber Drew Ruana spent over 100 sessions on Megatron without sending it. He described the problem as a V15/16 crux followed by V13/14 climbing, then brutal undercling thrutches at the end.

“The V14 stand is guarding the top, you've already done a hard boulder into a nasty series undercling thrutches with bad feet.”

McArthur's elite resume

McArthur has two V17 ascents: Megatron and No One Mourns the Wicked in Colorado. He's also topped at least two V16s and established Flower of Sulphur V16 in Squamish, which remains unrepeated.