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Journey deep underground and explore the top 10 longest cave systems on Earth. Discover about unique cave formations, and the secrets these hidden worlds hold.

Stern, the bow of the titanic and all sorts of pieces that fell off during that wreck. that's one of the problems in trying to find the submersible on the sea floor. it is like looking for a needle in a hay stack. >> bill: five people are on board. the oxygen supply is expected to run out this morning. the u.s. coast guard says this is still a rescue mission and family and friends are not giving up. >> so we've got to find them, the vessel. we have to find out what happened and we're ever hopeful we'll find the vessel that has some people alive inside it. you will recall the thai school boys i...

Manipulation of symbols among non-human species could have a much more complicated and dynamic history than previously thought, say scholars

The Great Blue Hole is a naturally-occurring marine sinkhole located about 62 miles off the coast of Belize City, near the center of Lighthouse Reef.

Ever heard of Russell Cave National Monument in Alabama? It is a unique and fascinating destination located in northeastern Alabama. Bridgeport to be exact.