Wildlife recordist Chris Watson and sound artist Prof Tony Myatt conclude their three-part odyssey to the west coast of Mexico to record the songs of blue whales in the Sea of Cortez. In the port of Loreto, Chris and Tony visit a local organisation set up to protect local wildlife, and Chris talks to whale communication expert Dr Valeria Vergara. They also turn to spectral analysis to see if they managed to record blue whales in action. Help support our independent journalism at theguardian.com/sciencepod
