The Capreolus 3D MSS is a three-dimensional marine seismic survey undertaken by Polarcus Seismic Limited (Polarcus) in Commonwealth waters of the Offshore Roebuck Basin. The Capreolus 3D MSS commenced in January 2015 following acceptance on 8 January 2015 of an Environment Plan (EP) for the proposed activities (Capreolus 3D Multi-Client Marine Seismic Survey 2014-2015. Environment Plan Document No. 0267070-P,Revision 0,dated 1November 2014, NOPSEMA reference A400021 ID2970). The survey originally scheduled to be completed by end of June 2015 is proposed to be extended to November 2015.
 
The Capreolus 3D MSS operational area comprises approximately 38,000 km2• The operational area incorporates the necessary space for vessel manoeuvring and ancillary activities (i.e. additional area for the purpose of line run-outs, source testing soft starts and turns etc.). At its closest the operational area is approximately 120 km north of Port Hedland and approximately 320 km west of Broome.
 
At any one time acquisition will be undertaken by up to two purpose-built, state of the art Polarcus-owned and operated survey vessels. The total volume of the planned seismic source is unchanged at 3,480 in 3. The survey vessels will be accompanied by up to four dedicated support vessels to maintain a safe distance between the towed array and other vessels, and also 1to manage interactions with shipping and fishing activities if  required.  The support vessels will also re-supply the survey vessels as necessary.
 
Since commencement in January seismic acquisition has been conducted in the central blocks of the operational area. It is planned for activities to then continue to the southernmost block ending in the northern blocks. Dates are subject to weather conditions and other delays. In addition, vessel availability and scope completion will influence exact start and end dates respectively. Regardless of delays the Capreolus 3D MSS is not planned to extend beyond November 2015.