A lot of weird-looking life-forms lurk in the deep sea, and this year we got some spectacularly close looks at several of them, including a goofy Doctor Who–esque octopus, alienlike Antarctic dwellers ...

When Ted Judah goes scuba diving off the coast in Monterey Bay, he normally swims at the surface to the area above the dive site and then descends. But on the morning of Dec. 30, the water was ...

Far below the ocean’s surface, light barely exists. Sunlight fades quickly, and what little brightness remains often comes from animals themselves — tiny flashes, glows, and pulses used to hunt or ...