The largest wave ever surfed


Despite technological advances, the process for accurately measuring big waves still involves scientific rigour and creativity. Experts pore over photographs, trying to determine the most reliable measurement reference point.

“You want the largest ruler possible in the image and to validate its size,” said Adam Fincham, a University of Southern California associate professor of engineering who specialises in geophysical fluid dynamics and led the analysis of Steudtner’s wave.

While jetskis – which are used to tow surfers into the world’s biggest waves – are the gold standard since the size is known and does not change, they are usually not present during key moments of a surfer’s ride. An entire body is also less useful, according to Fincham, because surfers will bend their knees or otherwise change their height during a ride.

The standard Fincham and his colleagues from Scripps Institution of Oceanography at the University of California San Diego and the Kelly Slater Wave Company settled on this year was Steudtner’s lower leg, from his heel to his kneecap.

“That distance does not change since you can’t bend your lower leg,” Fincham said.

The team asked Steudtner to measure that length, which effectively gave them a ruler for the image of the surfer’s ride.

The experts must study the image closely, accounting for distortions that might misrepresent the wave’s size. Different angles and cameras lenses could muddle the process.

’When you look for a record … you need a number. You can’t say, ‘It was just about that’. We’re comfortable with it.′

The University of Southern California’s Adam Fincham

To account for how to correct the images, Fincham travelled to Nazare and stood at the locations where photos and videos of Steudtner’s ride were captured, calculating the camera angles and the distance of the camera to the wave face. He also interviewed the two photographers whose imagery was used to analyse the wave, learning more about the equipment they used and how they levelled their cameras.

With this information in hand, the analysis team used 3D modelling software to geometrically correct the photos and convert pixels to inches. Using the lower leg standard, they could begin to measure the wave from trough to crest.

Since he began analysing waves a few years ago, Fincham said the science has evolved with a better understanding of camera parameters. He also said using the lower leg as a reference point is a step forward, though he noted that not all surfers keep their front leg as perpendicular as Steudtner.

Asked about his assessment of the accuracy of their work, Fincham said, “That’s a difficult question,” and noted his team arrived at a number for which there was consensus.

“When you look for a record … you need a number. You can’t say, ‘It was just about that,’ ” he said. “We’re comfortable with it.”

While some might still consider surfing to be a carefree activity, Fincham said he and his team kept the stakes of big wave riding in mind during their work.

“These guys are risking their lives, and you have to respect that and take it very seriously,” he said. “We really want to do the best job we can, so they have some confidence in it and we owe it to them to do our best job.”

While Steudtner’s ride is now authenticated by Guinness World Records, there are others who have claimed to have surfed even bigger waves. Even Steudtner has ridden waves that some have estimated to have topped 100 feet.

But sometimes the photos and videos don’t support the claims, and other times surf officials and their teams of scientists study the evidence and find something lacking.

‘Being from Austria and Germany, I wasn’t meant to be a surfer’, says Sebastian Steudtner.Credit:Getty

Given the difficulty of accurately measuring a wave’s size, WSL limits the time-intensive process to rides that are honoured at the annual Red Bull Big Wave Awards. Steudtner’s big wave was eligible for review because he won the Biggest Tow Award in 2021.

“No one’s saying this is the biggest wave ever surfed in the world,” Fincham said. “It certainly might be, but this is the biggest certified wave. There may have been a bigger wave surfed; there’s just no photo of it.”

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While Steudtner is proud to have the record, he does not see it as the most important part of his story.

“Being from Germany and Austria, I wasn’t meant to be a surfer. Anything that you can dream up and set your sight on, if you never give up and pursue it, you can reach it,” he said.

When next season approaches, he said he will be ready for an even bigger bomb, though record-chasing is not what drives him.

“It sets me free,” he said of life on the water. “It’s like freedom.”



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