Photographer: Helen Groger-Wurm2019-11-012019-11-013/10/1960http://hdl.handle.net/1885/1816433.5cm x 2cmmounted transparencycolourimage/tiffimage/jpgen-AUThis item is provided for research purposes. Contact the Australian National University Archives at butlin.archives@anu.edu.au for permission to use.Green Island - Underwater Observatory2019-11-01