The little blue octopus was spotted in 2015 by researchers aboard the submersible Nautilus in 5,800-ft. deep waters. The sub’s remotely operated camera was visually combing the ocean floor when it ...

"If we [humans] continue to do business as usual, it's a distinct possibility that we reach the climate tipping point sooner ...

The world’s oceans are rising at an accelerating pace, and scientists now say they can fully explain what’s driving it.

A new study from Adelaide University has found that when ocean acidification makes reef habitat less complex, the fish living there gather in smaller shoals that offer less social protection.

Most rivers around the world are losing oxygen as climate warming and heatwaves intensify, according to a major new study.

The oldest eukaryotes we've found lived exclusively on the seafloor and already used oxygen. The discovery overturns certain long-held assumptions about the group while corroborating others.

The Ocean Census project says scientists have discovered 1,121 previously unknown species in a single year. The rush is on to ...