A group of five Italian scuba divers died while exploring a deep underwater cave near Vaavu Atoll. No one knows what happened.

Instead, there are two caves that alternate as the record holders for the deepest cave on our planet: Veryovkina and Krubera-Voronya ( ...

The light fades as divers disappear farther into a cave system, until the greenish hue from their flashlight is all that’s visible, bouncing off walls, picking out creatures humans might never have ...

A remotely operated vehicle exploring a dark limestone cave 385 meters beneath the ocean surface near a remote Japanese island captured a flash of brilliant green light when its mechanical arm brushed ...

In fact, here are 19 wondrous caves in the U.S. that, in our opinion, are must-sees for any traveler or adventure-seeker.

The group had been diving in ⁠caves in the Vaavu Atoll at a depth ⁠of around 50m (165ft). They were reported missing by the ...