This dataset contains the processed Hydrology (HYD) data collected on Diamantina voyage Dm 1/79. The voyage took place in the Equatorial NE Indian Ocean off Sumatra during May - June 1979. This dataset has been processed and is archived within the CSIRO Marine and Atmospheric Research Data Centre in Hobart. Additional information regarding this dataset is contained in the cruise report for this voyage and/or the data processing report (as available). Diamantina on-voyage hydrology data are typically obtained from water samples collected in Nansen bottles at various depths. Parameters measured normally comprise temperature, salinity, dissolved oxygen and inorganic phosphate.