hydrophone recording adventure: what lies beneath the boardman river! Published 1 year ago • 149 plays • Length 30:00 Download video MP4 Download video MP3 Similar videos 0:51 listen to what lies beneath the surface of the boardman river 5:42 lessons: what is hydrophone? 2:23 the hydroacoustic network and how it works 4:31 boardman river nature center 4:23 hydrophone recovery in armintza (bizkaia) - safesave 0:40 unveil the secrets of stardiver!