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The GSC would be attached to a pipe and lowered from an oil rig. The stabilizers on the bottom of the GSC would sink in the to ocean floor and fix the its position over the gushing gas, oil, and mud.
The GSC would have both internal and external pressure sensors. The pump would be a variable rate pump.
Once the GSC was position over the gusher, the oil and gas would float to the top and the mud would sink to the open bottom. The pump would be started slowly and begin to pump up a mixture of gas, oil, and seawater. Some of the mud would sink to the bottom, forming a pile of mud at the base of the GSC, and eventually forming a seal between the GSC and the ocean floor.
As that seal began to form the pump rate would be raised until the pressure inside the GSC was slightly lower than the outside pressure, perhaps 3 to 5 psi lower. If the GSC was 40 feet across at the base, it would have a base cross sectional area of about 180,000 square inches. At a four psi pressure differential it would be attached to the sea floor with a force of around 360 tons. Of, course if the pressure were to become to high, the seal would be broken by seawater tunneling under the skirt of the GSM, so the best pressure value would need to be established experimentally.
As long the right pressure could be maintained by controlling the variable rate pump with feedback from the pressure sensors, it should be possible to get all of the oil to the surface and into the refinery system.
Disruptions to that balance could be caused by weather, or equipment malfunction, but it should be vastly preferable to letting all the oil loose into coastal waters.
Since the GSC would only need to withstand a relatively minimal amount of pressure, it could probably be fabricated from heavy sheet metal reinforced with a steel frame.
If this method works it could contain any high pressure underwater oil spill, not only preventing an environmental disaster, but recovering the oil.