Fig. 1: Polymetallic nodules on the seabed in the eastern Pacific.
From: Metal mining on land versus the ocean in the context of the current Biodiversity Crisis

Top: large glass sponge attached to dense loose nodules, 2600 m depth; lasers 10 cm apart. Credit: NOAA Ocean Exploration. Bottom: sponge and anemone on scattered nodule substratum, about 4000 m depth. Credit: NERC SMARTEX Project. Image provided by Natural History Museum and National Oceanography Centre.