Bulky 'C-123 providers' spray chemical defoliant over Vietnam in 1968. (Right) Nguyen Ba Quy Phuoc, 14, attends a physio class at a school for agent orange victims.

Tucked away and almost forgotten, this secret bridge was the perfect spot for a magnet fishing mission. With no one around and murky waters below, we had no idea what we’d find — but what came up was ...