Is the hole on Mars a hoax?

I read an article the other day about a hole that had been discovered on Mars. It was about the size of a football field and appeared to be the opening to a much larger cavern. The HiRise took pictures of it. Is this true or is it a hoax.
Update: Ok...this didn't come off as a hoax at first. But such a discovery like this had me wondering why there wasn't very much chatter in the science community about this. I appreciate everyone's responce in helping resolve the confusion. Thanks!
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