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Connor Berryhill was only 5 years old when an underwater encounter with an endangered monk seal set him on a path to take care of the world's most vulnerable creatures. Now 11, he's taken his small-scale activism big and started his own nonprofit, MicroActivist. Their mission: to connect youth with projects to protect the ocean -- and save our planet's oceans and seas.

Sand strikers, also known as bobbit worms, are primitive-looking creatures that lack eyes, or even a brain. Despite this, they are savage predators who shoot out grapple-like hooks to reel in passing fish.

Sunken relics, ghostly shipwrecks, and lost cities aren't just wonders found in fictional adventures. Beneath the ocean's surface, there are ruins where people once roamed and shipwrecks loaded with artifacts from another time.

Renowned waterman and big wave surfer Mark Healey explains his personal connection to the ocean.

In the deepest, darkest parts of the oceans are ecosystems with more diversity than a tropical rainforest. Taking us on a voyage into the ocean -- from the deepest trenches to the remains of the Titanic -- marine biologist David Gallo explores the wonder and beauty of marine life.

While the Earth's oceans are known as five separate entities, there is really only one ocean. So, how big is it? As of 2013, it takes up 71% of the Earth, houses 99% of the biosphere, and contains some of Earth's grandest geological features. Scott Gass reminds us of the influence humans have on the ocean and the influence it has on us.

While there's no shortage of weird and wacky ideas in science fiction about what creatures from other planets might look like, few are quite as remarkable as those that can actually be found right here on Earth.

A sea turtle rescue center in North Carolina cares for and rehabilitates injured sea turtles, and returns them to the ocean amid cheering crowds. Sea turtles are resilient, but they are slow to recover. So the Karen Beasley Sea Turtle Rescue and Rehabilitation Center spends a lot of time and effort to help save loggerhead and other Atlantic Ocean turtles.

Getting tossed around by shore break and slammed into the sand day after day is a rough go; Clark little wouldn't have it any other way. in fact, for the North Shore Local, Its all in a good days work.

National Geographic was able to film A record-breaking school of mobula rays arriving off the coast of Baja but what they did was totally unexpected. This was a stunning show by these sleek, mysterious ocean dwellers. I wonder what they're actually doing...it almost seems like they're celebrating.

Michael Fishbach, co-founder of The Great Whale Conservancy (GWC), narrates his encounter with a young humpback whale entangled in local fishing nets.

David Gallo shows jaw-dropping footage of amazing sea creatures, including a color-shifting cuttlefish, a perfectly camouflaged octopus, and a Times Square's worth of neon light displays from fish who live in the blackest depths of the ocean.

The FLIP (FLoating Instrument Platform) is a research vessel that can rotate to a vertical position. It is currently owned by the Scripps Institution of Oceanography.

We've added the very first underwater panoramic images to Google Maps, the next step in our quest to provide people with the most comprehensive, accurate and usable map of the world. With these vibrant and stunning photos you don't have to be a scuba diver-or even know how to swim-to explore and experience six of the ocean's most incredible living coral reefs. Now, anyone can become the next virtual Jacques Cousteau and dive with sea turtles, fish and manta rays in Australia and Hawaii. Check it out