mussels and other recognisable beasts. These creatures were found dwelling 2,515 metres (8,250 feet) below the surface of the Pacific Ocean in hidden holes within a hydrothermal vent field.

Deep-sea Bathymodiolus mussels are found worldwide at hydrothermal vents and cold seeps. The mussels live in symbiosis with beneficial bacteria that provide them with nutrition. The mussels also ...