This release subsided, although bubbles were seen and heard from the top of the conductor on the well. This was followed by another UHR at 07:23, of higher pressure and volume than the initial UHR, containing a mix of unignited oil and gas. Soon after, the rig was abandoned by all personnel, since safety was compromised due to the presence of unignited hydrocarbons. Soon after the second UHR at 07:23, PTTEP reported the UHR to AMSA, and control over the UHR was transferred to AMSA, in accordance with the provisions of NatPlan and NMOSCP. 3 Australian Maritime Safety Authority, Major Oil Spill: Montara Well Head Platform (2009)