Corals are extremely fragile organisms, this one was unfortunate to have its back lumped propably by a heavy object. But these organism will recover and heal itself.
Have A great weekend folks.
234s . f/18.0 . ISO 100 . 10 mm
This shot comprised of using a Hoya ND400(10x stop) filter and I added Hitech Reverse GND 3stop to balance out the sky