Some undiscovered ones may extend far deeper into the Earth than the record of 1.36 miles.
The new arachnid was discovered in its underground lair, a limestone cave.
Researchers from Lund University in Sweden have shown that well-developed eyes come at a surprising cost to other organ systems.
People have long debated whether the red pictographs of Utah's Black Dragon Canyon are images of humans and animals, or a large winged monster.
Some of the oddest sites on our planet are below the surface.
The yeast produces a compound shown in the lab to inhibit the fungus that causes the deadly condition in bats.
A new centipede named after Hades, the mythical god of the underworld, is a top predator in this mysterious underground world. Continue reading →
See amazing footage from a drone fly-through of the Hang Son Doong cave in Vietnam, the largest in the world.
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