Researchers have found new southern areas of Tasmania that include corals, lobsters and molluscs with more than 100 species of unknown species.
The mission led by CSIRO returned to Hobart on Wednesday, the "plain mountains" for four weeks.
Most of the mountains are protected by Tasman fractures and Huon marine parks.
"We have surveyed 45 total routes and crossed seven in detail," said travel statements by the scientist Alan Williams of CSIRO.
The group found all kinds of underwater creatures: heart-shaped squid, ghosts, sharks and basketball eels.
"Now, largely, the data of animals that live on the shores and their communities vary widely, and they have a much wider life span on the surrounding lands," said Dr. Williams.
And he said "we have taken over the distribution of corals for months in full, we've already seen many deep-seated beaches on the seafloor hills and climb the ridges away from the hills."
"This means that this important coral reef has been seen in the Huon and Tasman fracture maritime parks we have seen before."
While the park heads the Australian Marine Protected Area Branch, Jason Mundy has said that "research trips are critically important for understanding, appreciating and protecting the Australian parks."
"The image of this journey reminds us of an extraordinary and diverse environment that we protect from these special places."