Largest oil spill in the Gulf:
The 2-mile-deep exploratory well, Ixtoc I, blew out on June 3, 1979 in the Bay of Campeche off Ciudad del Carmen, Mexico. By the time the well was brought under control in March, 1980, an estimated 140 million gallons of oil had spilled into the bay. The Ixtoc I spill is currently #2 on the all-time list of largest oil spills of all time.
IncidentNews: 10 Famous Spills
Note duration and size of the spill. Largest estimate to-date for our spill: 29 million barrels.
Apparently blowing up the well is a bad idea, because it allows the oil to be outside the casing. At this point we are trying to get control of the casing and stop the flow. Blowing up the pipe just adds another step to the process and makes thing more out of control.
Relief wells will eventually work. It will be August until that is done. Containing the oil floating around is a priority for now. That will require multiple tankers equiped with pumps to suck up the oil.