Right now a documentary series is in production which wants to compete with „Oceans“ and „Our blue planet“. This time with the focus on something unseen or beter unheard of in the long history of underwater documentaries. The sound un­derwater. Together with the renowned Alfred Wegener Insti­tute the crew is hunting for new sounds in this unknown world with helicopters, sonar buoys, submarines and a lot of hydro­phones. Get a glimpse behind the scenes.