Hydrothermal vents, colloquially "black smokers", are places on the ocean floor where superheated water and minerals break through, spewing columns in the water. The minerals form huge spires, as though they are chimneys. The mineral rich water also provides food for a number of animals, IE yeti crabs, tube worms, Pompeii worms, and various shrimp.
The model I have made in this set is very detailed. It contains 1 vent, with tube worms (the red and white pieces) and deep sea shrimp on its surface. Transparent brown pieces represent the water spewing out, and the green, orange, and tan pieces represent the mineral deposits which make up the vent. I built this set for fun and I think it would make a great set because of its accuracy.