Field recordist Luke Pearson wanted to hear what was happening in the Ohio River, so he dropped a hydrophone in at Portland Wharf Park. Instead of the marine life he expected he heard marine traffic. Find out what the fish might hear as a barge passes into the McAlpine Locks and Dam. To hear the full recording, explore the sound map, or submit a sound visit www.wfpl.org/sounds or www.kentuckianasounds.org.