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Environment
Chronology Of A Catastrophe
June 14, 2010
| A version of this story appeared in
Volume 88, Issue 24
April 20
Initial explosion on Deepwater Horizon exploration rig kills 11 people. (1)
April 22
Second explosion sinks rig.
May 2
BP starts drilling first intercept relief well.
May 7
BP lowers containment dome over leaking wellhead, but methane hydrate crystals clog tube and the attempt fails. (2)
May 12
Research vessel Pelican finds data that suggest a giant underwater oil plume.
May 15
EPA approves subsurface use of dispersants.
May 16
BP inserts tube into riser to siphon off a small part of leaking oil and gas.
May 17
Drilling of a second relief well begins. (3)
May 19
Order to restructure Minerals Management Service is signed.
May 20
EPA directs BP to find less toxic and more effective dispersants.
May 26
EPA calls for reduction in dispersant use and says it will look for an alternative.
May 27
U.S. Geological Survey estimates leak to be 17 million to 39 million gal, making it the worst oil spill in U.S. history; Obama announces freeze on new exploratory drilling activities; and MMS head S. Elizabeth Birnbaum resigns. (4)
May 29
Attempt to plug well with drilling mud fails.
June 3
BP cuts pipe from well, lowers containment cap onto it, and begins to funnel oil. (5)
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