Upper Black Box

[Back_Country_Hiker]

I was curious if anyone happened to know where the deepest, narrowest portion of the Upper Black Box is located. I've been told there is a segment where the depth is great enough and the width is pinched enough that direct sunlight never reaches the bottom. If such is true, then that particular location is the one I would most be interested in seeing. I have seen other sections, for instance the Lockhart Box area, and a couple others. I have investigated on Google Earth and it suggests that perhaps this place might be the piece that is situated nearest the Mexican Bend area- is that correct?

Thanks!