Have you ever seen a fish swim upside-down? Be on the lookout for tiny, colorful basslets swimming belly-up when you're wall diving in the Caribbean — especially in Little Cayman Island and southern Cuba. Want more Critter Hunt adventures? Go to scubadiving.com.

Did you know that Bluefin Tuna are one of the most valuable fish species in the world? So to prevent overfishing, scuba divers in the Mediterranean help ensure that an epic tuna fishery stays sustainable.

Mary O'Malley helps nations understand why we need to save sharks and manta rays. She has worked in Indonesia and with WildAid, Shark Savers and Manta Trust.

Thinking about diving in Indonesia? Want to see more fish, nudibranchs and other weird creatures than ever? Then read about underwater photographer Judy G's experience on the Wallace Line! Want more underwater pictures? Go to scubadiving.com.

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Would you brave a shark encounter in an inflatable raft? These boaters did, and they bit off a little more than they could chew.

This volcanic vacation destination trumped the competition in five Top 100 Readers Choice awards, including a No. 1 spot for shore diving.

Amazing time-lapse night-footage captured using Sola Nightsea blue fluorescent light. Filmed on location in Lembeh, Indonesia by Jeff Honda and the Backscatter team.

Have you ever seen a Sea Angel (Clione limacina)? While scuba diving in Russia's White Sea, photographer Franco Banfi captured this underwater photo of the elusive creature. See what camera gear he used, and where to go to make the dive yourself! Want more photos that make you LOOK? Go to scubadiving.com.