claim: Pulmonary embolism is indicated by high blood oxygen levels.
evidence: The Bay City Walking Dredge is a historic structure in Collier County , Florida .. It was built in 1924 and declared a National Historic Mechanical Engineering Landmark in 1994 .. National Historic Mechanical Engineering Landmark. National Historic Mechanical Engineering Landmark. It was added to the National Register of Historic Places on May 29 , 2013 .. National Register of Historic Places. National Register of Historic Places. It is located at 20200 E. Tamiami Trail in the vicinity of Naples , Florida at Collier-Seminole State Park .. Tamiami Trail. Tamiami Trail. Collier-Seminole State Park. Collier-Seminole State Park. The dredge was used to construct part of the Tamiami Trail .. Tamiami Trail. Tamiami Trail. dredge. dredge