The Cold War is done and dusted (well, kind of) but its legacy still lives on, even in the bodies of creatures living in the world's deepest underwater trench. At the bottom of the West Pacific, in its darkest depths – the deepest point on Earth, in fact, the Mariana Trench – scientists have discovered the presence of unstable carbon isotopes in the bodies of shrimp-like beasties. By tracing the unique "fingerprint" of the isotopes, they were able to trace it back to the nasty leftovers of nuclear warheads detonated during the Cold War. Reporting in the journal Geophysical Research Letters, scientists led by the Chinese Academy of Sciences documented how atmosphere explosions from nuclear warheads above the Pacific ended up in the guts of tiny crustaceans at depths of up to 11,000 meters (36,000 feet). The team of scientists started by collecting small crustaceans, known as amphipods, from the Mariana Trench, Mussau Trench, and New Britain Trench in the spring of 2017. Analysis of