AdvertisementDigging In The Mud To See What Toxic Substances Were Spread By Hurricane HarveyOctober 23, 2017Rebecca HersherfacebookEmailLindsay Cristides, a master's student in oceanography at Texas A&M University, anchors a research vessel in the Houston Ship Channel before taking samples of sediment left behind by Hurricane Harvey floods. The samples will be tested for contaminants including heavy metals. (NPR)