If you search the forum you will see a lot about this hole.
Some suggest that the sand is really deeper and it's a misprint that was never fixed.
Some also say that the shot gets the best results only if dinged, and that is SOP but it's good to keep in the back of your mind.
Some threads about it below:
http://www.wgt.com/forums/t/17500.aspx
http://www.wgt.com/forums/t/133062.aspx
http://www.wgt.com/forums/p/3132/15433.aspx#15433