Repeat survey of the International Indian Ocean Expedition line (IIOE-2)

A coupled bio-physical, ecosystem-scale, examination of the International Indian Ocean Expedition line.
Voyage No


14 May, 2019


14 Jun, 2019




Chief Scientist

Prof Lynnath Beckley


Murdoch University

Voyage summary

Research voyage to conduct an extensive deep ocean survey in support of the 2nd International Indian Ocean Expedition (IIOE-2).

Sixty years ago, researchers aboard vessels from 14 countries combined their efforts to explore the largest unknown area of earth, the deep waters and seabed of the Indian Ocean. This world-first expedition generated a wealth of information and provided a baseline that formed the basis of our scientific understanding about the Indian Ocean basin.

This voyage is a repeat of the 110°E line survey from 1963, which was completed by HMAS Diamantina visiting stations on voyages undertaken every six weeks for a year. RV Investigator will visit 20 stations along a 3000 km transect off the coast of Western Australia during this one month voyage. This will be an integrated whole-of-ocean ecosystem study that includes physical processes, biogeochemistry, nitrogen sources, microbes, primary production, zooplankton, mesopelagic fishes, food webs and whales. The voyage is a major part of Australia's contribution to the UNESCO-led IIOE-2 mission and will provide data to examine the effects of climate change on the waters of the Indian Ocean.

The voyage includes only the primary research project but involves significant international collaboration.

The science team on this voyage includes 40 participants from 18 institutions - including international participation - as well as scientists and postgraduate students from seven Australian universities.

Voyage outcomes

Summary of voyage outcomes - as well as voyage image gallery - will be published approximately one month after completion of the voyage.

Voyage blog:
Dropping a line in the Indian Ocean

Led by Chief Scientist Professor Lynnath Beckley from Murdoch University, a team of 40 marine scientists, students and technicians from 18 institutions have just departed Fremantle to take part in the 2nd International Indian Ocean Expedition (IIOE-2).

Those on board will spend 32 busy days at sea, sampling across 3,000 km of the deep ocean along the 110°E longitudinal line, approximately 500-600 km offshore from the coast of Western Australia.

Read more on CSIROscope
A CTD being lowered into the ocean at sunset