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In the early 1940s, near Coeur d’Alene, Idaho, lake monsters — or at least reports of them — began to show up in Lake Pend Oreille. Typically, the sightings were of large, not clearly visible objects moving rapidly through the water. Some of the earliest printed accounts, heavily laced with ridicule, appeared in U.S. Navy publications from the Farragut Naval Training Station at Bayview, Idaho, a top-secret submarine sonar research facility.
Why is the Navy in North Idaho of all places, 350 miles from the nearest ocean? Mostly, to take advantage of the conditions in Lake Pend Oreille. The largest lake in Idaho and the fifth deepest in the United States, Pend Oreille offers a virtually ideal venue for acoustic testing.