Staghorn coral planted by scientists in the Florida Keys. Researchers hope to give the same sort of boost to the world's shrinking population of pillar coral, now that they can raise the creatures in a laboratory. Joe Berg/Way Down Video/Mote hide caption

itoggle caption Joe Berg/Way Down Video/Mote

Oceans, and the innards of Earth itself, are the final frontiers of our planet. Expect amazing discoveries as explorers document more and more of this unseen realm. Hulton Archive/Getty Images hide caption

itoggle caption Hulton Archive/Getty Images

Heron Island is located on the southern end of the Great Barrier Reef, about 25 miles off the northeast coast of Australia. Ted Mead/Getty Images hide caption

itoggle caption Ted Mead/Getty Images