Myths tell of a beautiful "crystal palace" at the bottom of the sea, but in reality it is cold and dark in the deep, deep sea, where the sun does not shine. But for many kinds of creatures, it is their home. Large groups of unusual and somewhat strange-looking creatures roam the dark depths of the ocean, carrying "little lanterns," or luminaries, as they do so.

In the darkness, the light from the "lanterns" allows the deep-sea fish to recognize their own kind and lure in other small fish for food.

There are two types of light emitters in fish: one is the light-emitting cells in the fish's skin, which secrete a phosphorus-containing mucus that emits light when it comes into contact with oxygen in the bloodstream. Some fish's luminescent structure is also very complex, the outside of the light-emitting cells are surrounded by reflective cells and pigment cell layer, the top of the luminescent and searchlight structure is similar to the structure of the lens-like structure, the lantern fish's luminescent is such, and therefore can emit a relatively bright light.

Another kind of luminescence is inside the luminescent bacteria, the seabed there is a kind of not enough 10 centimeters long light lids silk in the santan is to borrow the bacteria's ability to light. Its luminescence in the eye below, inside hundreds of millions of light-emitting bacteria, these bacteria from the blood of the fish into the energy of fluorescence. The wonderful thing is that the light lid silk has a layer of black membrane, the membrane rises up to cover the luminescence, like a flashlight switch, can make the light disappear, so you can escape from the big fish.