Acoustic detection of ultra-high-energy neutrinos

At ultra-high energies (>1018 eV) the Earth is opaque to neutrinos and detection techniques other than the optical Cherenkov technique must be pursued. Here the possibility of detecting neutrinos via their acoustic signature is discussed. The paper presents an overview of current worldwide activities in the acoustic detection field which includes recent results from test experimental set-ups, simulation work, sensitivity calculations and results from data taken at deep-water deployments.