Yeah its some growth, sponge , weed , etc growing over a cave structure,,,,,,,,,, maybe,,,,,,,, that's why those live feed cameras you can drop down are so good for helping to learn what your sounders trying to tell you.

I have no idea what the sounder is showing but if you got those two good dhuies of it who cares

 They look to be coming up over a meter so I wouldn't think weed, and looks relatively solid with some softer stuff on top.
So to me maybe a rocky, ledge reef with some weed/corals on top ?

Im certainly no expert so will be good to see others opinions 

 Looks like a nice edge.. no insanely obvious fish shows above it.. but doesn't mean fish can't be within cracks, etc.. under ledges. Going from fishing to diving - when you see the ground with your eyes there's always more to it than what you'd think on the sounder 

Would be nice to drop a camera down there and have always wondered what it is ! Nice to hear other people's opinions thanks ! Seems to pull dhuies when we find that orange flare ! Spewing shrimps, occys etc even though fish don't show on the sounder ! 

 Pic on the right showing good solid ground, like said above probably crevices for the Bangers to dwell in. Good growth about 1m high, certainly worth the drop. I remember when I first started with sounders a member on here who always cleaned up said anything that looks like anything is worth a drop. He used to hover the boat over whatever and fish with the other hand lol. 

 i remember a few years ago members reckoned you couldnt possibly see caves or ledges on a sounder

I reckon you could have this a bit higher . Say around 1/10 th of the depth . Just so bit if clutter  . Looks good ground but higher gain will pick up few more fish . Just my opinion