This translucent Deepstaria jelly unfurled as it whorled and shapeshifted in currents created by ROV Hercules' thrusters. Its bright red resident isopod, a relative of the pillbug, can be spotted hanging on for the ride!

Mount Paektu (also known as Changbai Mountain) is one of the largest volcanoes on earth and yet, for the longest time, nobody could explain where it came fro...

What's the Deepest Hole We Can Possibly Dig?