The Hranice Abyss — or "Hranická propast," in Czech — is the deepest known freshwater cave in the world. Geologists think it ...

Hranice Abyss: The deepest freshwater cave on Earth and a conduit to a 'fossil' sinkhole. Sascha Pare. Fri, October 4, ... Related: Deepest blue hole in the world discovered, ...

What are the odds of drilling a two-inch hole and hitting a 67.5-million-year-old dinosaur bone over 760 feet below a museum parking lot? Statistically speaking, it’s nearly impossible. As Denver ...

The deepest drilling attempt’s technology by America. Drilling the earth to its core is not a new concept. With a world wanting to get rid of fossil fuels and into renewable energy, drilling the earth ...

Scientists have yet to reach the bottom of the Taam Ja' Blue Hole in Mexico's Chetumal Bay, which new measurements hint could be connected to a labyrinth of submarine caves and tunnels.

Sinkholes don't just happen on land, they also happen in the ocean where they're known as blue holes. And now, researchers say they've found the deepest one yet on the planet – one so large that ...

Although scientists did not drill into the mantle – or set a record for deepest hole ever drilled beneath the seafloor – they did recover the deepest mantle rock ever, getting samples from as ...