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On April 20, 2010, a semi-submersible exploratory offshore drilling rig in the Gulf of Mexico exploded after a blowout and sank two days later, killing eleven people and causing a massive oil spill threatening the coast of Louisiana, Mississippi, Alabama, Texas, and Florida. The rig is owned and operated by Transocean Ltd on behalf of BP, which is the majority owner of the oil field. The company originally estimated the size of the leak at about 1,000 barrels a day but later accepted government estimates of a leak of at least 5,000 barrels per day (790 m3/d). On April 30, BP stated that it would harness all of its resources to battle the oil spill, spending $7 million a day with its partners to try to contain the disaster. BP was running the well without a remote control shut-off switch used in two other major oil-producing nations, Brazil and Norway, as a last resort protection against underwater spills. The use of such devices is not mandated by U.S. regulators. The U.S. Government gave the responsibility of the incident to BP and will hold it accountable for costs incurred in containing the situation. On May 11, 2010, Congress called the executives of BP, Transocean, and Halliburton to a hearing regarding the oil spill. When probed for answers regarding the events leading up to the explosion, each company blamed the other. BP blamed Transocean who owned the rig, who then blamed the operators of the rig, BP. They also blamed Halliburton, who built the well casing. Scientists have been requesting the right to monitor the amount of oil that is actually being released per day, but "'The answer is no to that,' a BP spokesman, Tom Mueller, said on Saturday, May 15. 'We're not going to take any extra efforts now to calculate flow there at this point. It's not relevant to the response effort, and it might even detract from the response effort.'" Steven Wereley, an associate professor of mechanical engineering at Purdue University, analyzed videotape of the leak using particle image velocimetry and estimated oil flow rates at between 56,000 to 84,000 barrels per day (8,900 to 13,400 m3/d), or equivalent to one Exxon Valdez spill every 3.5 to 2.4 days. A second, smaller leak has been estimated to be releasing 25,000 barrels per day (4,000 m3/d) by itself, suggesting that the total size of the leak may well be in excess of 100,000 barrels per day and became the largest oil spill in US history.