Before The Silent World, almost nobody had seen the inside of the sea. A few helmet divers had walked on the bottom, and a few photographers had taken black-and-white pictures through glass, but the idea of humans swimming freely among fish, with no air hose, was new. Cousteau’s book described that freedom in words, and three years later his film showed it in colour on cinema screens around the world. Between them they did more than anything else to make scuba diving a popular activity and the ocean a subject of public fascination.

As a diver, I owe a lot to this story. As someone who cares about reefs and sharks, I also find parts of the film hard to watch. Both reactions are worth explaining.

The book (1953)

The book Le Monde du silence tells the story of Cousteau and his friends from the late 1930s to the early 1950s, as they invented and tested the equipment that made modern diving possible.

Cousteau wrote it with Frédéric Dumas, one of his two closest diving companions alongside Philippe Tailliez. It begins with the first experiments in goggles off the French Riviera, then describes the development of the Aqua-Lung with the engineer Émile Gagnan in 1943 and the first dives with it. Later chapters cover the founding of the French Navy’s Undersea Research Group in Toulon, deep-diving experiments that brought the team face to face with nitrogen narcosis (which Cousteau called l’ivresse des grandes profondeurs, “rapture of the deep”), the search for the bathyscaphe and the excavation of the Roman shipwreck at Mahdia in Tunisia, and the early voyages of Calypso.

The book was an immediate success. The English edition came out in 1953 and became a bestseller in the United States and Britain, and it went on to sell millions of copies in many languages. It is still in print and still the best introduction to the early days of diving; see our full list of Jacques Cousteau’s books for what came after.

Frédéric Dumas and the “sea musketeers”

The book is as much about a friendship as about equipment. Cousteau, Dumas and Philippe Tailliez called themselves the mousquemers, a play on “musketeers” and mer, the sea.

Tailliez was the naval officer who first lent Cousteau a pair of diving goggles in the 1930s and introduced him to spearfishing off Toulon. Dumas was a civilian and an outstanding breath-hold spearfisherman, by most accounts the strongest swimmer of the three, and he became the team’s most daring test diver. When the Aqua-Lung was ready, it was Dumas who made many of the deepest trial dives, including a dive to around 62 metres in 1943 that was a record for compressed-air diving at the time. Much of the most vivid writing in The Silent World comes from these test dives: the cold, the dark, the strange euphoria of depth and the uncertainty of not knowing what the human body could tolerate.

Reading it as a diver, what strikes me is how little they knew and how bravely they worked around it. There were no dive computers, no decompression tables designed for this kind of diving, and no training agencies. Every safety rule we take for granted today was learned by people like Dumas, sometimes the hard way.

Making the film (1954–1956)

The film was shot over about two years aboard Calypso as she cruised the Mediterranean, the Red Sea, the Persian Gulf and the Indian Ocean.

Cousteau co-directed with Louis Malle, then a film student in his early twenties who would go on to become one of France’s most celebrated directors. Underwater colour filming was still in its infancy. Water absorbs red light quickly, so even a few metres down the world turns blue-green. To restore colour, the team used powerful artificial lights, which was one reason the film looked so astonishing to audiences in 1956. Divers rode underwater scooters, explored wrecks, filmed coral reefs and fish at close range, and recorded encounters with sharks, whales and dolphins.

I have spent a lot of time trying to get colour right in my own underwater photos, and I still use colour correction on almost every shot. Knowing how hard that is with modern cameras, the colour in The Silent World is a remarkable achievement for 1956 equipment.

Palme d’Or and Oscar

The Silent World premiered at the Cannes Film Festival in 1956 and won the festival’s top prize, the Palme d’Or.

It was the first documentary ever to win the Palme d’Or, and it remained the only one for nearly half a century, until Michael Moore’s Fahrenheit 9/11 won in 2004. The following year, The Silent World won the Academy Award for Best Documentary Feature. Cousteau would win a second Oscar for World Without Sun in 1965. Commercially the film did very well, and it made Cousteau and Calypso famous far beyond France, paving the way for the television series that made him a household name in the 1960s and 1970s.

What the film showed for the first time

For most viewers in 1956, nearly everything in The Silent World was new.

The opening shots of divers descending with torches through blue water, trailing streams of bubbles, became one of the defining images of the 20th century. Audiences saw coral reefs in colour, divers swimming with schools of fish, a shipwreck explored from the inside, and a large grouper the crew named Ulysses, who followed the divers around like a pet and was fed by hand. They saw sperm whales and dolphins from Calypso’s bow and sharks feeding at close range. Many people who later became marine scientists and divers have said the film was where their interest began.

The scenes that have not aged well

Watched today, several scenes in The Silent World are shocking, and it is worth being honest about them.

In one sequence the crew sets off dynamite on a coral reef in the Indian Ocean to kill the fish so they can collect and count the species living there, a method that was then used in some scientific surveys. In another, Calypso runs into a pod of sperm whales and its propeller badly injures a calf. The crew shoots the injured whale, sharks arrive to feed on the carcass, and crew members haul sharks onto the deck and kill them with hooks and axes in a scene played as a battle against savage enemies. Divers also ride on sea turtles for fun. By modern standards, these scenes show destruction of a reef, cruelty to animals and a view of sharks that we now know is completely wrong.

It is important to see these scenes in context. In the 1950s the ocean was widely regarded as limitless, sharks were seen as vermin, and scientific collecting often meant killing. Cousteau himself changed a great deal. By the late 1960s and 1970s he had become one of the most important voices for ocean conservation, campaigning against nuclear waste dumping and commercial whaling. The contrast between The Silent World and his later work is a measure of how much attitudes changed in a generation, and how much he helped change them. Our page on Cousteau’s accomplishments follows that shift.

Why The Silent World still matters

The title itself turned out to be wrong, and that is part of its legacy.

The sea is not silent. Since the 1950s, hydrophones have revealed a noisy world of snapping shrimp, grunting fish, singing whales and clicking dolphins. Cousteau knew this too, and later films made use of underwater sound. But the title captured how the ocean felt to the first free divers: a world without the noise of the surface, where you hear only your own breathing and bubbles. Anyone who has dived knows that feeling.

More than any single scene, what The Silent World did was open the door. It showed millions of people that the sea could be entered, explored and loved, and it pointed a generation toward diving, marine biology and conservation. If you want to understand where modern diving came from, read the book, then watch the film with the caveats above in mind, and then look at how far we have come. For the equipment behind it, see our page on the Aqua-Lung, and for the ship, Calypso.