patagonia since 2007, studying whale acoustics use underwater microphones. she s recorded tens of thousands of hours of blue whale song and has made an extraordinary discovery. we found out that the blue whales here produce a unique song dialect. in fact, these are a distinct sub-species of blue whale, up of just five on the planet. but they are not the only leviathons in the water. susanna s data has revealed a shocking and unfortunate coincidence. the noise made by large ships is in the same frequency band as