Scientists have just made a shocking discovery that could give some exciting information whilst exploring a giant blue hole in the Great Barrier Reef, which up to now geologist have only managed to describe.

While much is not know about the hole, scientists say that initial exploration suggests despite extensive coral bleaching in the area, the formation is home to healthy coral colonies.

A marine biologist from the Whitsundays, Johnny Gaskell, shared a stunning image of the hole on his Instagram page.

He wrote: ‘This blue hole has previously been described by geologists who suggested it could be even older than the famous Great Blue Hole, in Belize.

‘Its location is in one of the least explored parts Great Barrier Reef, over 200km from Daydream Island.

‘To get there we had to travel overnight for 10 hours and time the tides perfectly…Was well worth it!’

Yesterday's Blue Hole mission in the Great Barrier Reef. This Blue Hole has previously been explored and documented by geologists who suggested it could be even older than the famous Great Blue Hole, in Belize. It's location is in one of the least explored parts Great Barrier Reef, over 200km from our home @daydreamislandresort . To get there we had to travel overnight for 10 hours and time the tides perfectly… Was well worth it! Inside the walls was similar to the site we explored a few weeks back, but this hole was deeper and almost perfectly circular. We dived down to just over 20m yesterday, before hitting bare sediment, that slowly sloped towards the centre. Again it was great to see big healthy coral colonies. Stay tuned for video footage of the coral within…

A post shared by Marine Bio | UW Photographer (@johnny_gaskell) on

The discovery of healthy coral comes as a surprise to many as the Great Barrier Reef has undergone two bleaching events in the last two years, where warmer sea temperatures have caused the corals to lose their colourful algae.

The discovery of healthy coral in the sinkhole raises hopes for the rest of the Great Barrier Reef.