A massive environmental calamity rocked the ancient Mediterranean. It took millions of years for the ecosystem to recover.

The cave, a popular dive spot accessible only by boat, is about five meters deep and has a long vertical opening. Thousands ...

In Hawai‘i, people, pigs, and ecosystems only have so much room to coexist, and the pigs exist a little too much.

One Great Shot: Are You Ready for This, Jelly? During a nighttime dive, a veteran underwater photographer captured a tiny fish’s cunning effort to find a safe spot in a dark sea.