Discover the Deepest Hole in the U.S. (5 Times Deeper Than the

A-Z Animals was founded on three guiding principles: accurate content you can trust, spreading knowledge on the animal kingdom, and giving back. Today, more than 30,000 species are threatened with extinction, and thousands would already be lost without tireless conservation efforts. Knowing that the first step toward conservation is spreading knowledge of the incredible animals species across our planet, A-Z Animals was founded in 2008 to offer an online encyclopedic resource across animals of all kinds.

How Deep Is the Deepest Hole in the World?

Mariana Trench and Challenger Deep: 6 facts about the oceanic chasm

10 Deepest Parts of the Ocean

10 Deepest Parts of the Ocean

Bertha Rogers's Instagram, Twitter & Facebook on IDCrawl

The deepest hole we have ever dug

The World's Deepest Pits

China Is Drilling a 10,000-Meter-Deep Hole Into the Earth - Bloomberg

Ask Smithsonian: What's the Deepest Hole Ever Dug?, At the Smithsonian

15 DEEPEST Holes on Earth