This story was originally published in bioGraphic and appears here as part of the Climate Desk collaboration. The deep sea contains many things: shipwrecks laden with gold, submersibles stuffed with sightseeing billionaires, and an absolutely unfathomable number of fish. If you could somehow put all the world’s fish in a giant pile—all the tuna; all the herring; all the mackerel, sardines, and anglerfish—around 90 percent, by weight, would have come from the ocean’s twilight zone. Faced with crushing water pressure, a near-total lack of light, and vast areas to search,…
