The large hole is believed to have been caused by three small leaks on a four-inch water pipe.

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Denman completely misjudged his jump two fences out, leaving David Pipe's 12-1 shot to pass the post four-and-a-half lengths clear of Exotic Dancer.

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The leaks - about 5, 000ft (1, 525m) under the surface - were found on Saturday, four days after the Deepwater Horizon platform, to which the pipe was attached, exploded and sank.

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