The Second International Indian Ocean Expedition (IIOE-2): Revisiting 110°E

The four previous Special Issues of Deep-Sea Research II pertaining to the Second International Indian Ocean Expedition (IIOE-2; Fig. 1) compiled diverse studies from different investigators working throughout the Indian Ocean. This fifth Special Issue is focussed on a single research voyage undertaken in May-June 2019 with the Australian RV Investigator. The voyage revisited an oceanic transect line along the 110°E meridian in the south-east Indian Ocean which was first studied from 1962 to 1963 during the First International Indian Ocean Expedition (e.g., Rochford, 1969; Tranter, 1977).