22 July 2013: Glass flotation spheres imploded on the ROV Jason elevator at the wellhead of the CORK in Cascadia Basin. The initial implosion, which was loud enough to saturate the hydrophone, and following 10 echos were recorded by an Ocean Sonics icListen low frequency hydrophone deployed at 2662 m depth at our Cascadia Basin node.

As indicated by the areas of white and red shading, the initial pressure wave and first echo or reflection from the surface saturated the hydrophone at Cascadia Basin. Sound waves traveled upward through the water column to the ocean surface 2.7 km above the implosion site and were then reflected back down to the seafloor where they were detected by the hydrophone. Each echo represents a 5.4 km round trip, or 54 km for the series of 10 echoes.

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