Level 1 — Absolute Beginner

There is a country in West Africa called Benin. Long ago, in the 1960s, people found signs of a coral reef there, deep under the sea.

The scientists at that time thought the reef was dead. For 60 years, everyone believed this.

Now, new scientists went back to look. They used a robot drone and special cameras. They found something amazing.

The reef is alive! It has many colorful corals and fish. It is more than 50 meters under the water.

coral reef

a structure in the ocean made by tiny sea animals called corals

ocean

a very large area of salt water

dead

no longer alive

scientist

a person who studies the world through experiments and research

drone

a machine that can move without a person inside it

camera

a device used to take pictures

alive

living; not dead

deep

going far down

Level 2 — Elementary

Off the coast of Benin, a country in West Africa, scientists have found a coral reef that was believed to be dead for more than 60 years.

In the 1960s, surveys searching for good fishing areas noticed signs of a deep-water coral reef. At the time, researchers assumed the reef could not still be alive.

Recently, a new team of scientists returned to the area with modern sonar equipment, an underwater drone, and special cameras provided by the National Geographic Exploration Technology Lab.

The cameras revealed something surprising: a healthy coral garden more than 50 meters below the surface, with at least eight different types of coral and eight kinds of fish living among them.

The lead scientist, Gérard Zinzindohoué, works at a research institute in Benin. The discovery suggests that other hidden reefs may exist along the coast of West Africa, still waiting to be found.

survey

a careful examination or study of an area

assume

to believe something is true without proof

sonar

equipment that uses sound waves to find objects underwater

underwater

below the surface of water

reveal

to show or make something known

surface

the top layer of water or land

researcher

a person who studies a subject carefully

coast

the land next to the sea

Level 3 — Intermediate

More than sixty years after surveys off the coast of Benin flagged a possible deep-water coral reef, scientists have confirmed that the reef is not only intact but thriving with marine life.

The original surveys, conducted in the 1960s to identify promising fishing grounds, detected signs of coral formations but assumed, without further investigation, that the reef had long since died.

A modern research team revisited the site armed with sonar surveys to narrow their search area, then deployed an underwater drone and the Deep Sea Camera System, technology provided by the National Geographic Exploration Technology Lab, to investigate directly.

What the cameras captured, more than 50 meters beneath the surface, was a mesophotic coral garden, a patchy ecosystem of coral communities supporting at least eight coral types and eight species of reef-loving fish.

Gérard Zinzindohoué of the Institut de Recherches Halieutiques et Océanologiques du Bénin, lead author of the findings published in Frontiers in Marine Science, said the discovery hints that West Africa's coastal waters likely harbor other overlooked reefs that have never been formally documented.

intact

not damaged or broken; remaining whole

thriving

growing and developing successfully

detect

to discover or notice the presence of something

deploy

to put something into use or position for a task

mesophotic

relating to a moderately lit zone of the ocean below shallow reefs

ecosystem

a community of living things interacting with their environment

harbor

to contain or hold something, often hidden

document

to formally record information about something

Level 4 — Advanced

More than six decades after surveys off the coast of Benin first flagged the possibility of a deep-water coral reef, researchers have confirmed that the formation is not merely intact but flourishing with an unexpectedly rich array of marine life.

Those original surveys, undertaken in the 1960s to chart promising fishing grounds rather than to catalogue marine ecosystems, registered indications of coral but proceeded on the untested assumption that any such reef would long since have perished.

A contemporary research team returned to the site equipped with sonar to narrow the search area before deploying an underwater drone alongside the Deep Sea Camera System, apparatus furnished by the National Geographic Exploration Technology Lab, to conduct a direct visual survey.

What emerged from that survey, at depths exceeding 50 meters, was a mesophotic coral garden: a patchwork ecosystem sustaining at least eight coral taxa and eight species of reef-associated fish in conditions long presumed inhospitable to such life.

Gérard Zinzindohoué of the Institut de Recherches Halieutiques et Océanologiques du Bénin, lead author of the study published in Frontiers in Marine Science, characterized the find as evidence that West Africa's coastal waters likely conceal further reefs that have escaped documentation altogether, a reminder of how much of the deep ocean remains effectively unexplored.

flourish

to grow or develop in a healthy, vigorous way

register

to record or indicate the presence of something

untested

not yet proven or verified through examination

perish

to die, especially in a sudden or violent way

apparatus

equipment or instruments designed for a specific purpose

taxa

groups of biologically related organisms, such as species or families

inhospitable

not suitable for living things to survive in

unexplored

not yet examined, mapped, or investigated