how underwater oil drilling works

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I can understand how the on-land drilling works. Oil exists, maybe under pressure under ground, and when you drill a pipe to the surface, you can start pumping things. Underwater though, I got questions. shouldn’t like, the oil start dispersing in the water? How do they make sure it goes into the pipe instead of leaking? How do they even detect it that far under water? I’ve seen oil gushers before, but how do you check for an oil gusher underwater, especially in the first oceanic oil wells?

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