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Wait for it! This unidentified jellyfish was seen floating through the water column, before quickly retracting its tentacles and swimming away. This is likely a defensive response to the presence of the Deep Discoverer remotely operated vehicle.

Video courtesy of the NOAA Office of Ocean Exploration and Research, 2016 Deepwater Exploration of the Marianas.

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Related Links

2016 Deepwater Exploration of the Marianas

NOAA Ship Okeanos Explorer