Smashing up guitars is a classic rock star activity, but how about drowning them? 7-year-old listener Cornelius has set CrowdScience a challenge: to find out what happens if you play a guitar underwater. Could this be the next avant-garde music sensation?

Host and amateur musician Caroline Steel tackles Cornelius’ question with the help of one increasingly soggy guitar. The UK’s National Physical Laboratory is our first port of call, with a guitar-sized water tank at the ready, and acoustic scientists Dr Freya Malcher and Ben Ford helping tackle our questions.

Since an acoustic guitar’s sound is amplified by its internal chamber, what happens as that chamber starts to fill with water? How about if the whole guitar - strings, body and all - is submerged? What difference does it make if our ears are listening above or below the water? And can special water-adapted microphones help us explore this unusual question, before our guitar disintegrates?

Our guitar then heads off on tour to Denmark, where the band Between Music have teased out questions just like these for their underwater music project, Aquasonic. We talk to violinist and Innovative Director Robert Karlsson, and singer Nanna Bech, who also plays a unique subaquatic instrument. With their help, we discover how to get the best out of a submerged guitar, and find out whether other instruments are better suited to the life aquatic. Presenter: Caroline Steel

Producers: Cathy Edwards and Florian Bohr

Editor: Ben Motley

National Physical Laboratory: Underwater Acoustics - https://www.npl.co.uk/research/underwater-acoustics

Between Music: Aquasonic - https://www.betweenmusic.dk/aquasonic

Photo – Caroline Steel and Nanna Bech in an Aquasonic aquarium playing a guitar. Copyright BBC.