Sound on — that was the theme as seen on our Instagram this week. Our Oct 30 reel, "Science Meets Magic: Our Hydrophone," paired a marlin coming boatside and swimming off strong with something you cannot see in a photo: real humpback song from our hydrophone recordings, the same singing guests hear live on board. That is what whale season on Oahu's North Shore sounds like right now, and October is only the beginning. What the hydrophone hears off Haleiwa Humpback whales retur