Located between 400 and 600 kilometres south east of Darwin.
In 2013, Santos completed a 500-kilometre, 2D seismic survey over the EP 161 permit.
The Tanumbirini-1 exploration well, located in EP 161, was spudded in June 2014 and was drilled to a total depth of 3,945 metres. Multiple thick intervals of organic-rich rock were intersected at the primary objective Mid-Velkerri level, accompanied by significant mud gas shows. Elevated gas readings were encountered over a total gross interval in excess of 500 metres. A 90-metre core was taken and extensive wireline evaluation conducted. The well was cased and suspended for re-entry at a later date.