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I was doing my 15 foot safety stop in 60 feet of water when those Eagle Rays passed under me. Those trails in the sand look too big to be Marlinspike Auger's considering the depth I was at but who knows? MY gf Chris often follows the trails and finds Marlinspike's at the end of them. I was solo diving on this dive.friscuba:That looks as though there was a pretty good sized marlin spike auger or other snail under the rays- the trail in the middle was huge and well defined. Ever check trails to see what's underneath at the end?