(AP) " It should have been a perfect day for Vincent Petit, finishing up an afternoon gallop on a wide expanse of beach along a pastel-colored bay. Instead, he and his mount were sucked into a hole of noxious black sludge.
The horse died within seconds, the rider lost consciousness and a dirty secret on the Brittany coast reverberated across France - decaying green algae was fouling some of its best beaches.
A report ordered by the government after the accident found concentrations of hydrogen sulfide gas emitted by the rotting algae were as high as 1,000 parts per million on the beach where the horse died - an amount that "can be fatal in several minutes."
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