Click to play videoOn the Great Barrier Reef, Australia: Visiting the Great Barrier Reef is a chance to experience a spectacular world beneath the sea.
But to the sea divers, a visit to the reef is serious business.
Reef Check Australia keeps an eye on the health of the coral reef and up close, which has become fragile.
"Corals have been around for huge amounts of time, and yet there's several different pressures that can actually affect them as this living organism," Roger Beeden of Reef Check Australia.
Often called the world's largest living organism, stretching two thousand km (over 12 hundred miles) the Great Barrier Reef is under threat. It's faced over fishing and pollution.
Moreover a recent report by the United Nation's intergovernmental panel on climate change said global warming could make the reef 'functionally extinct' within 50 years.
Over time, increased levels of carbon dioxide in the air can make the ocean more acidic, making it difficult to sustain life among the corals.
Millions of people rely on reefs around the world as a source of food. They protect coastlines from damage and the natural beauty attracts plenty of visitors.
Even on a rocky day, one can get a clear view of the coral reef and the marine life that lives in the heart of the Great Barrier Reef, off the coast of northeastern Australia.
No one is sure how it will adapt to climate change in the long run. But there is consensus on this: the thought of an Australia without the reef is unthinkable.
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