Researchers discovered the coral gardens using a remotely operated vehicle known as SuBastian.
The findings are some rare good news for corals around the world, which are facing numerous severe threats.
A scientist told "Newsweek" he was shocked to find some and coral communities have vanished completely since 1928.
"The tourism industry, desperate to maintain tourist numbers, is looking beyond the natural beauty of the reef because it's not quite what it was," said dive operator Tony Fontes.
"The presence of corals in these extreme mangrove habitats challenges our understanding of the conditions some corals are capable of living in," researcher Emma Camp said.
Climate change is one of the greatest threats facing coral reefs around the world today.
Some 5,000 feet beneath the surface of the sea lies a world of weird and wonderful species.
Four-fifths of the coral around the island has been destroyed.
Coral reefs around the world are facing a number of threats which are devastating coral populations.
A new study indicates that coral is fighting for its own survival in the face of climate change.
Coral reefs around the world are coming under increasing environmental pressures.
But today's threats are far more intense than those of the past.
Rising water temperatures are killing corals—but researchers think we can stop the die-off.
This dynamic duo is another deadly threat to coral reefs. But people can do something about it.
The hungry critters are eating away at the reef and there's no good way to get rid of them.
"There's just no time for these systems to recover."
Dozens of species in the reserve cannot be found anywhere else in the world.
New research shows corals can re-emit sunlight as a red-orange glow.
Two thirds of the coral reef—designated a world heritage site—have been damaged, according to aerial surveys.
Coral bleaching is decimating the globe's sea life, but some experts believe tapping the latest technology could reverse the trend.
Researchers found that oil altered microbial communities living in these artificial reefs deep beneath the sea.
The coral were produced from sperm and egg harvested in the wild.
Watch out, crown-of-thorns starfish.
The discovery of damaged coral far from the spill's epicenter signals widespread damage.