Alex Mustard / A diver exploring a coral reef with formation of brown tube sponges (Agelas conifera) red rope sponges (Amphimedon compressa) and deepwater sea fans (Iciligorgia nodulifera) East End, Grand Cayman, Ca...

Alex Mustard / Colourful coral reef wall, with yellow branching tube sponges (Pseudoceratina crassa), brown tube sponges (Agelas conifera) and red rope sponges (Amphimedon compressa), in front of deepwater sea fans...

Georgette Douwma / Graysby fish (Cephalopholis cruentatus) lying on Brown tube sponge (Agelas conifera) Bonaire, Netherlands Antilles, Caribbean

Georgette Douwma / Brown tube sponge (Agelas conifera) Bonaire, Netherlands Antilles, Caribbean, Atlantic Ocean.

Georgette Douwma / Brown tube sponge (Agelas conifera) and Row pore rope sponge (Aplysina cauliformis) Bonaire, Netherlands Antilles, Caribbean, Atlantic Ocean.

Georgette Douwma / Brown tube sponge (Agelas conifera) and Row pore rope sponge (Aplysina cauliformis) Bonaire, Netherlands Antilles, Caribbean, Atlantic Ocean.

Georgette Douwma / Brown tube sponge (Agelas conifera) Bonaire, Netherlands Antilles, Caribbean, Atlantic Ocean.

Georgette Douwma / Brown tube sponge (Agelas conifera) Bonaire, Netherlands Antilles, Caribbean, Atlantic Ocean.

Alex Mustard / Brown tube sponges (Agelas conifera) formation on reef wall with diver above, image taken with a circular fisheye, East End, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea.

Alex Mustard / Brown tube sponges (Agelas conifera) formation on reef wall, with diver in distance, East End, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea.

Alex Mustard / Brown tube sponges (Agelas conifera) formation on a reef wall, with sun shining through the water and diver above, East End, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea.