This will be an interesting case given that the root cause of the leak appears to be anchor dragging and the responsible shipping company has yet to be identified. Also, these informed quotes about leak detection from a previous post are highly pertinent:
“My experience suggests this would be a darned hard leak to remotely determine quickly,” said Richard Kuprewicz, a private pipeline accident investigator and consultant. “An opening of this type, on a 17-mile-long (27-kilometer) underwater pipe is very hard to spot by remote indications. These crack-type releases are lower rate and can go for quite a while.”
The type of crack seen in the Coast Guard video is big enough to allow some oil to escape to potentially trigger the low pressure alarm, Kuprewicz said. But because the pipeline was operating under relatively low pressure, the control room operator may have simply dismissed the alarm because the pressure was not very high to begin, he said.
ABC News
Bud's Offshore Energy (BOE) 
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