Paragorgia arborea is a Gorgonian coral found in depths between 90 and at least 2,500 metres (300-8,200 ft).
Regardless of height and width, they remain surprisingly thin. It's like those 2 dimensional trees in old computer games; they had to continually spin on the spot so that you never saw them from the side and noticed they were pixel thin. Disaster! Suddenly you realise you're definitely not actually aiming a bazooka at an enemy helicopter.