It sounds otherworldly, but the music produced by Danish ensemble Between Music was actually produced right here on Earth. "AquaSonic" is the name of the performance and it features the five performers playing custom-made instruments and singing while entirely submerged in water tanks.
The production's website states that years of research went into the performance in order to create the optimal instruments and techniques.
The artists conducted countless experiments in collaboration with deep-sea divers, instrument makers and scientists to develop entirely new, highly specialised subaqueous instruments. These include an underwater organ or hydraulophone, crystallophone, rotacorda, percussion and violin.
Between Music just wrapped up a sold-out, three-day premiere at the Operadagen Festival in the Netherlands, but according to its Facebook page, the ensemble is exploring the possibility of an international tour.
Watch a trailer for the performance below.