Transocean's Development Driller III started drilling a first relief well on 2 May 2010. GSF Development Driller II started drilling a second relief on 16 May 2010.[85][86][87] On 3 August 2010, first test oil and then drilling mud was pumped at a slow rate of approximately 2 bbl (320 L) per minute into the well-head. Pumping continued for eight hours, at the end of which the well was declared to be "in a static condition."[88] On 4 August 2010, BP began pumping cement from the top, sealing that part of the flow channel permanently.[89]