The enforcement of the Comprehensive Nuclear-Test Ban Treaty (CTBT) requires the monitoring of acoustic disturbances in the world's oceans in order to guard against the possibility of a nuclear test being hidden either in the water column itself or on a remote island. The traditional means of acoustic monitoring in the water column builds on the experience of the SOSUS project (e.g., Mikhalevsky, 1999), and consists of deploying hydrophones within the SOFAR channel, the layer of low acoustic velocity extending between depths of approximately 600 to 1800 m in the world's oceans, and functioning as a waveguide...

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