Hadal zone - Wikipediahttps://en.wikipedia.org/wiki/Hadal_zone
Hadal zone
NASA Is Launching a Submarine to Hunt For Life in The Mysterious Depths of The Seahttps://www.sciencealert.com/nasa-is-launching-a-new-submarine-to-hunt-for-undiscovered-sea-life
Hadal zoneOrpheus (drone submarine)
New Deep-Sea Robot Will Help Us Explore Oceans Throughout the Solar System - YouTubehttps://www.youtube.com/watch?v=lwp3pCoyYMU
Hadal zoneOrpheus (drone submarine)

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Hadal zone
Earth's oceans and seas