sidescan sonar image of mysterious objects on the floor of Astoria Canyon

Sonar "image" of mysterious objects on floor of canyon at 1000 m depth. The objects are 40-60 m in length and are large enough to cast an acoustic "shadow". They stand out on the sonar record because of the surrounding soft sediment, which is a poor reflector of sonar beams. Image courtesy of Lewis and Clark 2001, NOAA/OER.

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