Using a small robotic sub, scientists from Columbia University have captured rare video of arctic jellyfish slithering along the bottom of the Chukchi Sea near Utqiaġvik, Alaska. The footage came as a complete surprise to the researchers, who weren’t expecting to see jellyfish during the Arctic winter.

These seemingly oblivious shellfish are highly sensitive to sounds, which could help them monitor incoming tides, hear thunder and spot approaching predators

Plastic pollution, overfishing, global warming and increased acidification from burning fossil fuels means oceans are increasingly hostile to marine life

Sharks in a volcano? It's true.

A win for the environment.

Divers found octopuses building structures out of shells, socializing with neighbors.

The research could reveal where sleep came from and why we must spend so much time doing it.

Scary-looking fish found on a Texas beach after Hurricane Harvey is identified as a fangtooth snake-eel with the help of social media

So it’s up to people to keep dangerous trash out of the ocean’s food supply.

The ancestors of today's gentle giants of the ocean were equipped with the razor-sharp teeth of a fearsome predator and could have hunted seals and penguins, rather than the tiny krill they eat today, scientists say. The findings feed into the puzzle about how modern Mysticeti whales, which include blue, humpback and right whales, came to evolve bristle-like structures — baleen — that allow them to filter food from the water.

Just below the surface of the turquoise sea, coral flutters majestically amid schools of puffed up porcupinefish and fluorescent blue and yellow angelfish. The gangly staghorn and fanning elkhorn corals are thriving in swimming distance of Laughing Bird Caye, a tiny Caribbean sandy islet in southern Belize, thanks to a restoration project that is yielding striking results.

Research finds endangered Antarctic blue, fin and southern right whales struggling to recover despite hunting bans

Far below the surface of the sea, the seabed is being scoured by rivers of sediment that can flow thousands of miles from land.

For the first time in 100 years, sizable numbers of humpback whales are being spotted in the waters off NYC, and it's thanks to years of environmental clean-up efforts, Popular Science reports.

The surprising behavior has scientists asking new questions.

The shoes’ manufacturers harvest harmful algal blooms and turn the goo into footwear

A new species of a fossil pliosaur (large predatory marine reptile from the ‘age of dinosaur’) has been found in Russia and profoundly change how we understand the evolution of the group, says an international team of scientists.

On Wednesday, the Weather Channel posted a video of a digging clam to its Facebook page with the caption,

One of the highest concentrations of toxic pollutants ever recorded in a marine mammal has been revealed in a Scottish killer whale that died in 2016. The adult whale, known as Lulu, was a member of the UK’s last resident pod and a postmortem also showed she had never produced a calf. The pollutants, called PCBs, are known to cause infertility and these latest findings add to strong evidence that the pod is doomed to extinction.