The study examined the underwater sound pressure levels produced by the Wello Penguin's cooling system. The measured sound pressure levels suggest a source level of 140.5dBrms re 1μPa at 1m. Significant narrowband harmonics are evident generally at low frequencies although it is expected that ambient background noise levels to be reached within approximately 10m from the device. There was a degree of directionality of sound production due to the position of the equipment within the hull.
Airborne noise could not be examined due to the generator used to power the device but found to be unlikely to have any ecological impact when access hatches are normally shut during operation.