There was a fatality downstream around that time. This may be a memorial marker to the victim. Three divers entered downstream section, lead diver placed arrow pointing into Clear Cut passage instead of the actual exit back toward Emerald. Upon return to this point, and some disagreements, other two divers returned on line without arrow, lead diver followed his arrow. After reaching a depth, well in excess of his dive to that point, he realized his error and turned around. He drowned on the correct line but several hundred feet from daylight zone. The other two divers surfaced without incident. Moral to that story: ALL teams members should be watching any directional markers being added during a dive and signal OK as an agreement to it's position. IMHO