Interesting,several weeks ago read a post that a guy finally found a small pod of active fish when there was a lot of dirty water.Was doing well there when a group of jiggers set up on the spot.Poster said could not troll through that area anymore due to to many jigger had drifted,spot lock or anchored on the spot.Sounds like it was deep water and not on a reef.Maybe one of those trollers was getting even with those jiggers.