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Ever wonder why baleen whales became so colossal? Scientists have a theory.

The NOAA ship *Oscar Elton Sette* is on a 24-day research expedition to monitor, study and help the endangered species.

We just can't get enough of these nudibranch photos from the 2016 *Scuba Diving* magazine photo contest.

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Take a look at some of the strange and wonderful creatures that inhabit the ocean, as seen through the eyes of some of underwater photographers.

Nothing is more fun than diving with a group of playful pinnipeds.

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Ever wondered what it’s like to dive with a walrus?