Quadrant Energy Australia Limited (Quadrant Energy) drilled the Hyde-1 exploration well, located in Commonwealth waters off the coast of Western Australia, in February 2016.Hyde-1 is located in permit area WA-418-P approximately 200 km north of Dampier.The environment plan (EP) [EA-00-R1-281/1] for drilling of Hyde-1 was accepted by NOPSEMA on 11 February 2014.  Offshore activities described in the accepted EP have been completed.The well was initially spudded at 18o 53’ 08.66” S and 116o 33’ 23.75” E, in approximately 390m water depth.  However, after drilling to a depth of approximately 50m below the seabed, the 5” drill pipe became stuck during cementing operations for the 36” conductor and could not be recovered.  Consequently, the drill pipe was severed near the seabed and the MODU relocated to the final Hyde-1A well site and completed drilling to target depth.  The 36” conductor remains embedded in the seabed, with associated housing and the 5” drill pipe extending to a total height of approximately 5.9m above the surrounding seafloor. This unplanned event was not anticipated in the accepted (Rev 3) Hyde-1 EP.  Accordingly, Quadrant Energy has revised a part of the previously submitted EP to address the proposed response to the unplanned event.  Quadrant Energy intends to surrender the petroleum permit with the equipment in situ once all regulatory pre-requisites have been met, including acceptance of this EP revision (Addendum)