Science AMA Series: We’re scientists using sonar technology to map the seafloor and water column from NOAA Ship Okeanos Explorer. From May 20 - June 11, the ship will be mapping previously unexplored areas of the Pacific. Ask Us Anything! Scientists Aboard Okeanos Explorer Discover Largest Sponge Known in the World in Papahānaumokuākea Marine National Monument This stunningly beautiful jellyfish was seen during Dive 4 in the Marianas Trench Marine National Monument on April 24, 2016, while exploring the informally named “Enigma Seamount” at a depth of ~3,700 meters. Scientists identified this hydromedusa as belonging to the genus Crossota. Note the two sets of tentacles — short and long. At the beginning of the video, you'll see that the long tentacles are even and extended outward and the bell is motionless. This suggests an ambush predation mode. Within the bell, the radial canals in red are connecting points for what looks like the gonads in bright yellow. The low wide coral toward the bottom of the photo is precious red coral (Corallium sp.). These corals are valuable as jewelry. This unpatterned, brown cusk eel (probably an undescribed species) has color typical of many fishes living near the bottom between 0.5 and 3.6 miles (1,000 and 6,000 meters) down in the ocean.
In September 2009, a National Oceanic and Atmospheric Administration/Fugro multibeam sonar survey of the area around the Farallon Islands documented a probable shipwreck. Credit: NOAA/Fugro

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Navy ship mysteriously lost in 1921 found using multibeam sonar.

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