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Surfing a record 86-foot wave took guts. Measuring it took 18 months.

Sebastian Steudtner, a 37-year-old surfer from Germany, rode a giant wave in October 2020 in Nazaré, Portugal. After 18 months of detailed analysis, he learned the wave measured 86 feet, making it the largest ever surfed. (Jorge Leal/World Surf League)

Pro surfer Sebastian Steudtner was on his board, bobbing in the waters off Nazaré, Portugal, when he saw a lone monster approaching, steadily growing as it rumbled closer. He nodded toward his Jet Ski driver and held the tow rope tightly.

“I knew it,” Steudtner, 37, remembers thinking. “Get me this wave now.”

As the driver, Alemão Maresias, took a looping route into the wave, Steudtner could see the lighthouse, town and beach. He was about 60 yards behind the peak when he released the rope. He could hear his surfboard chattering and the wind roaring across his ears.

“I’ll never forget what I saw when I started to drop behind the peak and saw the entire wave,” he said. “I started to accelerate like crazy. I had tears from the wind speed and was just holding on with everything I had — not doing anything funny, just hanging on.

“You don’t feel the size,” he added. “You feel the power. I felt the most power of any wave I’ve surfed at Nazaré.”

That memorable ride was in October 2020, and it took a full 18 months for the German surfer to learn just how big the wave actually was that day. The World Surf League and a team of scientists, along with Guinness World Records, revealed Tuesday that Steudtner’s wave measured 86 feet tall, making it the largest ever surfed.

The record eclipses Brazilian Rodrigo Koxa’s previous mark, set in 2017 at Nazaré, a wave that measured 80 feet.

For Steudtner, going from the pounding waves off Portugal’s Silver Coast to the record books involved a complicated, exhaustive measurement process. Traditionally, measuring wave heights in the surfing community has been fraught, a kind of guesswork bolstered by a surfer’s experience, with the unit of measurement often being the human body (“head-high”). The surfing community also has a notable, fundamental schism in determining wave heights. The Hawaiian scale involves an estimate from behind the wave, which produces a much smaller number than a crest-to-trough measurement from the front.

Despite technological advances, the process for accurately measuring big waves still involves scientific rigor 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 specializes in geophysical fluid dynamics and led the analysis of Steudtner’s wave.

While Jet Skis — which are used to tow surfers into the world’s biggest waves — are the gold standard because their 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 camera lenses could muddle the process.

To account for how to correct the images, Fincham traveled to Nazaré 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 analyze the wave, learning more about the equipment they used and how they leveled their cameras.

With this information in hand, the analysis team used 3D modeling 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 analyzing 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 think of surfing as 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’ve 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.

Given the difficulty of accurately measuring a wave’s size, the World Surf League limits the time-intensive process to rides that are honored 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.”

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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