A mysterious giant sea blob whose very existence was questioned has been rediscovered a century after its first sighting.
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Algae blooms on the West Coast of the U.S. in 2015 were bigger and more toxic than ever before, and have been linked to warm ocean conditions.
The deep-sea diving Gonatus squid has a hearty appetite, even when it comes to eating its own kind, a new study finds.
The discovery of a new species of rare and elusive whale in the North Pacific shows how little humans know about the deep and vast ocean, researchers say.
Scientists still know very little about the ocean, but here are some of the most peculiar things they've discovered.
As shark attacks dominate Australian headlines, an annual survey reports that there were more shark attacks worldwide in 2015 than in any other year on record.
An unusual sponge was making waves in waters near the Hawaiian Islands — though it doesn't wear square pants and is far too big to live in a pineapple under the sea.
The East Coast is sinking, which is worsening the impacts of sea level rise. These are the hot spots.
Australia's Great Barrier Reef corals are in trouble, with the northern part of the reef experiencing "the worst mass bleaching event in its history."
A recent high-profile study led by US climatologist James Hansen has warned that sea levels could rise by several meters by the end of this century. How realistic is this scenario?