Ever been curious what its like to free dive with sharks? Dr. Mauricio Hoyos Padilla shares his experience tagging great whites.

Ned and Anna DeLoach started the largest fish-sighting database in the world. Working with REEF, the photographers made giant strides protecting coral reef and fish species.

Amazing underwater footage of the Solomon Islands shot with the latest capabilities of high-resolution 4K video by Josh Jensen of Undersea Productions.

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Looking for an out-of-the-ordinary shark dive? Here are five you probably haven't heard about but should — plus 15 favorites we just can't get enough of.

What do you know about plankton? They may be the smallest organisms in the ocean, but plankton play an enormous role in the ocean food chain.

Say hello to these prehistoric sharks — including the infamous Megalodon!

If you spy one of these ocean oddities, consider yourself lucky. These pelagic travelers pop up in every ocean, and though the world’s largest bony fish can grow to the size of a sedan, they spend much of their lives in deep, open ocean, where they remain something of a mystery.

Celebrate World Oceans Day with these 11 reasons to be optimistic about our oceans future.