After looking at the photos taken by the submersible, scientists were pleasantly surprised to find that this is a Styx jellyfish, a widely distributed but rare creature.

It has a jellyfish's iconic umbrella-shaped body, big and thick, with four tentacles attached to it. These tentacles are wide on the top and narrow on the bottom, like elegant ribbons.

Styx jellyfish is a relatively large jellyfish. Among the individuals found so far, the largest disc diameter is 1.4m, and the tentacle length is11m. Most of them live in 500-2000 meters of seawater, and their bodies are composed of water and colloidal substances. Therefore, jellyfish are not afraid of the pressure brought by seawater, and their tracks are also found at a depth of 6665 meters.

Generally speaking, when the water depth exceeds 1000 meters, Styx jellyfish will hide in this bottomless dark ocean, but if there is light, Styx jellyfish will look orange-red.

Jellyfish looks soft and "weak", but its lethality is not lost to sharks. Every year, many people die from jellyfish, which is 15-30 times that of shark attacks. This is because most jellyfish are poisonous. They inject toxins into the body through stinging cells on their antennae.

Styx jellyfish is special. It has no stinging cells on its tentacles, and mainly feeds on plankton and small fish by four banded tentacles. Because of its huge size, it is considered as one of the largest invertebrate carnivores in the deep-sea ecosystem.