Remotely operated vehicle image of the seafloor from Seascape Alaska 3 Dive 05 at 2,800 meters (1.74 miles) water depth from a highly structured continental slope. For scale, the image height is about 10 feet. The “fluffy-looking” muddy sediment is made of low-density organic matter that will compact and lithify to form very thin, organic-rich sedimentary rock layers like those on the right.