A two-week scientific expedition in international waters off the coast of Brazil has uncovered 31 previously unknown species, a pace researchers believe may be a record. The survey, conducted aboard the Schmidt Ocean Institute's research vessel Falkor (too) with two dozen experts from four countries, focused on the ocean midwater — the largely unexplored zone between the seafloor and the sunlit surface layer, which accounts for roughly 90% of Earth's living space. Discoveries included jellyfish, siphonophores, comb jellies, and single-celled giants, aided in part by a shipboard spinning-wheel confocal microscope nicknamed "the Squid," which allowed scientists to observe living cellular structures in 3D for the first time at sea.