Contain the bulk of the leak source with a 12' to 20' dia hollow screw shaped like a flower pot but without the bottom. Position 4 to 6 rockets near the top pointing slightly downward that are somehow deactivated after a certain screwed depth through the sea floor is reached. The top of the flower pot would have to have attachments for making a connection.
Answer to: How can I stop a large oil well from leaking?