This Aug. 17, 2021 photo shows Quagga mussels cover the engine of a Bell P-39 Airacobra military plane in Lake Huron, Mich., as maritime archaeologist Carrie Sowden, rear, documents the site. Archaeologists are scrambling to locate Great Lakes shipwrecks and downed planes before quagga mussels destroy them. (Wayne Lusardi via AP)