The raft noticed by the Hoults has been in contrast in dimension to Manhattan, Washington and 20,000 soccer fields.
The pumice raft was discovered by Australian sailors, Larissa Brill and Michael Hoult, who explain what it was like to accidentally sail into it.
When the pumice makes its way to the Great Barrier Reef, the sea life attached will travel too, potentially bringing diverse new colonies of barnacles, corals and more.
They have since sent samples of the pumice stone - which range "from marble to basketball size" - to researchers at the Queensland University of Technology (QUT) in Australia. In 2016, coral bleaching killed 29-50% of the reef's coral.
"Speaking to the Australian Broadcasting Corporation (ABC) on Friday, Bryan said, "[The raft] is a natural mechanism for species to colonise, restock and grow in a new environment", adding that it's just "one way that nature can help promote regeneration". They hope it will then deposit some life-giving organisms over the Great Barrier Reef, which has come under threat as a result of human industry and climate change.
"These float and form this huge raft of over 150 square km, which is drifting north towards Fiji in the ocean currents".
Scientists have said the "raft", which was about 90 percent underwater, was expected to make its way toward Australia within the next seven to twelve months.
NASA's Terra satellite tv for pc detected the pumice raft August 9, and the Operational Land Imager on Landsat eight captured photos of it days afterward August 13, based on the Earth Observatory at NASA.
A submarine volcano near the Polynesian island of Tonga in Oceana exploded two weeks ago, creating ash and stone debris in the Pacific which is heading towards the Great Barrier Reef.
The formation is so large it has been spotted on satellite imagery, while several sailors have posted remarkable footage of the unusual new floating island. Across the raft was discolored water, an indication that the volcano that produced it was slightly below, the Earth Observatory reported.
"First we thought it was whale poop", Whitehead advised BBC. "It looked nearly like there was more coming up, bubbling up from underneath", the couple wrote on Facebook.