On Australia's Ningaloo Reef, researchers and Australia’s richest man are using environmental DNA to unlock the mysteries of the world's biggest fish.

Ocean warming puts fish are at risk of becoming smaller due to the lower oxygen content of warm water, reports a new study.

The pioneering scientists sat down with Scuba Diving magazine to share lessons from their lives in the field.

Portugal has created the largest marine protected area in Europe, a 1,034 square mile reserve around the Selvagens Islands, an Atlantic volcanic archipelago.

*Belize Aggressor IV's* 24 dives in six days explore a newly minted shark sanctuary with worldwide implications.

MT *Haven*, the Mediterranean's largest wreck, is popular with fish and divers alike. Local divers are pushing the government to make it an MPA.

Fifty-one countries and the European Union have agreed on a two-year ban on the catch and retainment of shortfin makos.

PADI AWARE is releasing grants for blue carbon habitat restoration, marine debris citizen science, and more on its new Mission Hub Community Grant Program.

YouTube stars MrBeast and Mark Rober aim to raise $30 million to remove 30 million pounds of trash from the ocean, rivers and beaches around the world.