On 20 April 2010, a fire was reported on a Transocean-owned semisubmersible drilling rig, "Deepwater Horizon". "Deepwater Horizon" was a RBS8D design of Reading & Bates Falcon, a firm that was acquired by Transocean in 2001. The fire broke out at 10:00 p.m. CDT UTC−5 in US waters of Mississippi Canyon 252 in the Gulf of Mexico. The rig was off the Louisiana coast. The US Coast Guard launched a rescue operation after the explosion which killed 11 workers and critically injured seven of the 126-member crew.