These are known as 'The Thing'. Apparently it's very rare to see them in daytime (this was my first ever) - very reminiscent of the worms in Tremors - albeit underwater!
Washington State Department of Ecology
Flickr Group
Eyes Under Puget SoundThis species image was collected from Puget Sound sediments and photographed by the Washington State Department of Ecologys Marine Sediment Monitoring Team. For more information about this teams work visit: ecology.wa.gov/Water-Shorelines/Puget-Sound/Sound-science... Cant get enough benthos? Check out our Eyes Under Puget Sound Critter of the Month species profile blogs at ecology.wa.gov/Blog/Search?tag=7&category=2
Clusters of the marine polychaete Methanoaricia dendrobranchiata (red) with deep sea mussel Bathymodiolus childressi.Imaged from HOV Alvin during cruise AT26-15 in the Gulf of Mexico.Site: Brine PoolDepth: 651 meters