A collection of interesting video and audio clips from the ACO site.
Glass spheres provide floatation for oceanographic instrumentation to be recovered from the ocean bottom. Any small imperfections in the glass can cause the spheres to implode when under the immense pressure of the deep ocean. A glass sphere can be heard imploding by the ACO hydrophone on July 7th, 2011 from a oceanographic instrument mooring about 6 miles away. The subsequent echoes heard after the initial implosion are reflections of the initial sound from both the ocean surface and the seafloor.
Humpback and minke whales can be heard from a hydrophone during the Proof Module deployment for the ACO in April 2008. Humpback whales are known for their intriguing whale "songs" often heard during their annual visit to Hawaiian waters. Minke whale sounds begin about 13 seconds into the audio file.
A sperm whale pod can be heard from the ACO Proof Module hydrophone in 2007. The sperm whale sounds are distinguished as a series of "clicks". Humpback whales can be heard in the background of this audio file singing their "songs".