Scientists have found weird animals at the bottom of the ocean that challenge our understanding of life

Hadal dive with manned submersible Fendouzhe. This figure is created to depict these remarkable ecosystems, forming a "river" of chemosynthetic communities at the bottom of hadal trench - painting the ocean floor with a living kaleidoscope of deep-sea vitality - (Institute of Deep-sea Science and Engineering, CAS (IDSSE, CAS))

Strange animals found at the bottom of the ocean challenge our current understanding of life, scientists have said.

Researchers diving almost 10,000 meters deep into the Pacific Ocean found tube worms and molluscs that get their energy from chemical reactions, they say.