Pauline Hanson has donned a wetsuit and leapt into waters on the Great Barrier Reef in a bid to show the world the natural wonder is far from dead.
The senator who once cooked fish for a living went swimming with schools of them off Great Keppel Island on Friday and took a chip at green groups' claims about the reef's health.
Ms Hanson says agenda-driven groups are telling "untruths" about the reef that are destroying the tourism industry and businesses.
"When we have these agendas that are actually destroying our tourism industry and businesses ... we need to ask the questions and we want answers," she said.
"The Greens have no concern about people and jobs that we need here in Queensland and the escalating costs that we are feeling from the effects of this."
Yeppoon-based ferry operator Max Allen said the public's perception of the reef's health had definitely had an impact on visitor numbers.
"People turn up and say 'why are we here, isn't it dying'," he said.
Mr Allen said his Freedom Fast Cats operation was only averaging 17 visitors a day despite having once averaged 200, but noted resort closures and competition had also hit numbers.
One Nation senators Malcolm Roberts, who has long argued the case for global warming doesn't stack up - against overwhelming scientific consensus - and Brian Burston were also on the reef trip.
The party's WA senator Rod Culleton was notably absent after meeting this week with a frustrated Ms Hanson about his police investigation and High Court case.
The Queensland and federal governments were also diving into the argument about the health of the reef on Friday, announcing they would be splashing $45 million on a program to improve water quality and reduce sediment run-off at the Great Barrier Reef.
Australia is relying on its Reef 2050 Plan to convince the UNESCO to keep the Great Barrier Reef off its list of World Heritage sites in danger, and must provide a status update on measures taken to protect the reef to the UN body next week.
But Mr Roberts said Australia should not be reporting on the reef to a UN agency, which had "fabricated" climate change.
Ms Hanson said she wasn't an expert on the reef but believed humans were not responsible for coral bleaching and the debate surrounding its health had been politically driven.
Conservationists are concerned climate change is putting severe stress on the reef, which experienced a massive coral bleaching event this year, and some have declared it's dying at an unprecedented rate.
They say Ms Hanson and her senators visited the wrong part of the reef as the southern sections had been least affected by the worst bleaching event in the icon's history.
The World Wildlife Fund said One Nation should have visited Lizard Island, more than 1000km away where bleaching, caused by high water temperatures, has killed much of the coral.