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Los Alamos photographs celebrating the Laboratory’s past and present Following the world’s first nuclear test, Trinity, in 1945, Los Alamos scientists used a Lab-customized Sherman tank to roam the test site and collect radioactive debris and soil samples for analysis. To protect the scientists, the tank was outfitted with lead shielding and bottles of air for breathing. The scientists gathered samples through a trap door in the bottom of the tank. 34 Los Alamos National Laboratory