I agree with justin.i think that its a hard spot. (Good location to mark and fish)
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I figured it was a hard spot on the bottom, but I've always been puzzled that it doesn't look any different than the area around it other than the holes/beds that are under it on the image.
I've been back, and it is hard to find again. You have to go by from the right direction to make it show up.
455 gets out to the side further than 800.
I see! I guess that hasn't happened for me because I normally run my distance out from 75-100ft. Love seeing images posted on here. So neat!