Off the coast of Argentina, a research team set out to find cold seeps in the deep South Atlantic and found almost none — yet what emerged from the darkness instead has quietly redrawn the boundaries of what science thought it knew. The Falkor (too) and its remotely operated vehicle SuBastian returned with evidence of the world's largest known Bathelia candida coral reef, 28 candidate new species, a whale fall, and one of the ocean's rarest jellyfish. The expedition is a reminder that the deep sea — which holds 98 percent of Earth's livable space — remains more unknown than known, and that fai