FILE - In this Feb. 21, 2019 file photo, Army Corps of Engineers scientists drift in a boat toward a plume of red dye in the Savannah River, Ga., as they test large machines designed to boost oxygen levels in the river. Conservation groups say they “remain skeptical” that machines injecting oxygen into the Savannah harbor will offset threats to fish caused by deepening the busy shipping channel. However, the Southern Environmental Law Center says the groups it represents won’t return to court to fight the $973 million expansion of the waterway to the Port of Savannah. (AP Photo/Russ Bynum, File)
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