The substrate at the Dive 03 site was mostly dark, manganese-crusted rock with some soft sediment.
Substrate
Image courtesy of the NOAA Office of Ocean Exploration and Research, Mountains in the Deep: Exploring the Central Pacific Basin. Download larger version (jpg, 1.8 MB).

The substrate at the Dive 03 site was mostly dark, manganese-crusted rock with some soft sediment.

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