  An attractive technique to explore for super-high-energy cosmic neutrino
fluxes, via deep underwater acoustic detection, is discussed. Acoustic signals
emitted by the neutrino induced cascades at large distances (10-50 km) from
cascades are considered. It is argued that an existing hydroacoustic array of
2400 hydrophones, which is available in the Great Ocean near Kamchatka
Peninsula, could be used as a base for an exploratory acoustic neutrino
telescope SADCO (Sea Acoustic Detector of Cosmic Objects). The detection volume
for registration of cascades with energies in the range of $10^{20-21} eV$ is
estimated to be hundreds of cubic kilometers. Some models of extremely high
energy elementary particle production in the Universe (for example the
topological defect model) may be examined by such a detector. Tests of this
technique are hoped for within a year.
