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Luiz Rocha

2021 Rolex Awards Laureate

Explore and protect the Indian Ocean’s deep-sea coral reefs

A hundred metres or more beneath the ocean surface in the Maldives lies a twilight zone whose wondrous corals and strange life remain unexplored. In a pioneering diving expedition, a leading expert in the study of fish, Luiz Rocha, plans to survey these deep reefs to find and describe new species and make the case for their protection.

The sea has filled Luiz Rocha’s imagination from his earliest childhood in coastal Brazil and eventually drove him to master the highly technical diving required to reach depths 150 metres below the surface. In this crepuscular realm, unknown life thrives, including great forests of coral that provide both a nursery and pasturage for a host of unknown fish and other sea creatures.

In search of these deep, so-called mesophotic reefs, he now plans a pioneering expedition to explore the lower reaches of the atolls that comprise the Maldives in the Indian Ocean, a chain of islands long regarded as one of the last coral refuges on Earth. Little is known about mesophotic reefs worldwide – and nothing at all about reefs below 60 metres in the Indian Ocean, so Rocha will enter an environment unseen by humans.

I want to protect them [coral reefs] because they are unique products of an evolutionary process that took millions and millions of years. To me it is like art.

Luiz Rocha

Like all modern exploration, plunging into the twilight zone is risky, technically and physically demanding, and requires a high degree of discipline, determination and skill. Rocha has cultivated these attributes by spending more than 6,000 hours underwater on more than 70 scientific expeditions worldwide, half of which he has led.

Globally, shallow coral reefs are dying from the stresses of climate change. With its national income dependent on coral tourism and fishing, the Maldives government is keen to learn how to protect this precious national asset and discover whether deep reefs can serve as a haven for surface corals and the sea life they sustain.

“Because we do not know anything about them, most of those deeper reefs are not protected. Even in places like the Maldives, most of their deep reefs are not protected because the government does not, for the most part, even know they are there,” Rocha says. His first task is to enter the twilit depths, map them and discover exactly what they hold. Based on previous expeditions, he expects to uncover an abundance of new fish species and marine organisms, enlarging our understanding of life on Earth.

“I want to protect them because they are unique products of an evolutionary process that took millions and millions of years. To me it is like art.” The deep reefs may contain novel chemicals for human medicine, and are an important source of food to island nations. They offer a yardstick to monitor the ocean’s health in the face of expanding human impacts. His discoveries will aid the design of Marine Protected Areas around the world.

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