This investigative series uncovered a massive illegal shark-finning scheme and widespread labor abuses across the fleet of Dalian Ocean Fishing (DOF), a major Chinese tuna company with dozens of boats operating in international waters. Reporters tracked down and interviewed some two dozen Indonesian deckhands who worked aboard the company’s vessels, documenting their experiences with excessive work, substandard food and drinking water, illness, and deaths at sea. Their testimonies enabled Mongabay and its partners to determine that a tiny handful of DOF boats took more sharks than what China reported its entire longline fleet catching in the same place and time, which informed U.S. sanctions against the company.