  IceCube is a 1 km3 neutrino telescope currently under construction at the
South Pole. The detector will consist of 4800 optical sensors deployed at
depths between 1450 m and 2450 m in clear Antarctic ice evenly distributed over
80 strings. An air shower array covering a surface area of 1 km^2 above the
in-ice detector will measure cosmic ray air showers in the energy range from
300 TeV to above 1 EeV. The detector is designed to detect neutrinos of all
flavors. With 40 strings currently in operation, construction is 50% complete.
Based on data taken to date, the observatory meets its design goals and
currently exceeds the sensitivity of AMANDA and previous neutrino telescopes.
The construction outlook and possible future extensions are also discussed.
