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Tubeworms
Seascape Alaska 3 Dive 04 was dominated with dense “fields” of Lamellibranchia sp. tubeworms, like those pictured here from a depth of 2,018 meters (1.25 miles). The field extended at least 200 meters (656 feet) wide, but is likely even larger based on the bubble trail discovered during expedition mapping operations.
Credit

Image courtesy of NOAA Ocean Exploration, Seascape Alaska.