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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.

Watch as Scuba Diving magazine and Oris Watches present a $5,000 award to 2014 Sea Hero of the year Ken Nedimyer for his work on coral reef restoration, as well as congratulate the other 2014 Sea Heroes who were present at DEMA Las Vegas.

Scuba Diving magazine had a chance to catch up with 2014 Sea Hero Ken Nedimyer at DEMA Las Vegas to discuss his conservation work and new projects in the coming year.

Beautiful but deadly, this tiny critter is a close cousin of the blue-ringed octopus. Learn how pro photographer Jeffrey Chua de Guzman got the shot.