The Fifth Race Beneath the Surface: Where Modern Swimming Is Decided

In 2026, in Paris, I sat close enough to see what television never shows. When a swimmer leaves the wall after a turn, his entire body disappears beneath the surface for a stretch that feels impossibly long. The stands fall silent. A newcomer to swimming mistakes it for a rest between two strokes. I looked closer and saw the opposite: it is in that submerged stretch that a medal is written, or erased. In track and field, I learned to judge a hurdler by how he approaches the hurdle, not by his finishing time. In swimming, I learned the same lesson. I do not read the results board; I read the lane in their eyes, and that lane, in swimming, lies beneath the surface. Elite swimming has transformed over two decades. The previous generation decided races with endurance and stroke rate. The current generation decides them with what the rulebook calls the underwater phase. World Aquatics allows each swimmer up to 15 metres underwater after the start and after every turn. For the best, those fifteen metres are a miniature race tucked inside the larger one. I call it the fifth race. After the four strokes, freestyle, breaststroke, backstroke and butterfly, this is the fifth, one for which no medal is awarded separately, yet one every swimmer must master to win. A 100-metre freestyle swimmer actually strokes only about 60 to 65 metres. The rest he flies underwater with a dolphin kick. At the Paris 2026 Olympics, Pan Zhanle set the 100-metre freestyle world record at 46.40 seconds, and much of his margin over rivals was built in exactly those submerged stretches. When the gap between finalists is measured in hundredths of a second, every technical detail becomes a weapon. The underwater phase is the most underrated detail of all. Physics sides with the swimmer who knows how to dive. Below the surface, drag drops sharply compared with the surface, where waves and turbulence create wave drag. A dolphin kick underwater, executed correctly, produces far more propulsion than a surface stroke while burning less energy. Every metre swum under the water is a cheaper metre than one swum on top of it. Cheap does not mean easy. The underwater phase demands three things: body tension, kick amplitude and kick frequency. The swimmer must hold the body straight as a spear, wrists locked behind the head, legs kicking from the hips rather than the knees. Too much amplitude raises drag. Too little reduces propulsion. Kick frequency must match the breathing rhythm and the feel for the water. In track and field, I once analysed how a 400-metre hurdler optimises centrifugal force through the bend. In swimming, the turn is that bend. A poor turn can cost three to five hundredths of a second, which sounds tiny, yet in an Olympic final it is the distance between the top step and fourth place. Based on my experience watching races, I noticed a pattern that repeats itself. The gap between elite swimmers forms largely not in the final sprint, but in the second and third turns. The winner is not the fastest stroker over the last 50 metres, but the one who loses the least momentum on the turns. The way elite swimmers handle this submerged stretch is worth studying. They do not dive deeper than about a metre, because going too deep raises drag on the way up. They glide at a depth of roughly 0.6 to 0.8 metres, where the water is least turbulent. They count their kicks, not their distance. And they know exactly when to surface, the moment the body rises to catch the first stroke without losing speed. Not everyone enjoys the same advantage. In a short event like the 50-metre freestyle, where there are no turns, the underwater phase after the start is the single decisive factor, and so it is the most tightly policed by the rules. In a long event like the 1500 metres, the underwater phase is a small share, and endurance takes over. This is why I always view swimming through the lens of a track writer. Each swimming distance is like a different running event. The 50 metres is the 100-metre dash, everything rides on the start. The 200 metres is the 400 metres, a problem of distributing effort. The 1500 metres is the marathon, where tactics and patience decide. There is one fundamental difference. In track, the lane is fixed and the crowd sees everything. In swimming, the decisive part lies beneath the surface, where cameras struggle to follow and spectators struggle to see. What matters most is what is seen least. A common view holds that modern swimming is over-technical, that young swimmers are taught the underwater phase before they are taught to feel the water. I believe the opposite is true. The problem is not too much technique, but technique taught half-heartedly. Many training centres teach the underwater phase as a physical drill, how many kicks, how long to hold the breath, while forgetting that it is a skill of feel. You cannot kick well if you cannot feel the water moving around your feet. Track coaches understand this better than anyone: a great hurdler is not the one who jumps highest, but the one who feels the distance to the hurdle. A swimmer does not ask how deep the water is. He asks only where the finish line lies. The debate over whether to cap the underwater phase below 15 metres is returning. Some argue it strips the swimming out of swimming. Seen another way, the underwater phase is precisely what separates elite swimmers from the rest, and banning it is banning creativity. Sport always evolves by breaking what seemed unbreakable. What worries me more is how we measure. When technology lets us time to the hundredth, we readily read the figures and forget the body behind them. A beautiful dive is not in the number. It is in the moment the body glides like an arrow, without a flicker of hesitation. I trust intuition, but I have learned to make intuition wait for data. Swimming, in the end, is a sport of silences. Between two strokes there is a silence. Between two turns there is a silence. And beneath the surface, in the submerged stretch the stands cannot see, lies the greatest silence of all, where a champion is truly born. Next time you watch a swim race and see the swimmers vanish beneath the surface, remember that the race does not stop there. That is where it begins.