KM3NeT: A Large underwater neutrino telescope in the Mediterranean Sea

High energy neutrinosproduced in astrophysicalprocesses will allow for a new way of studying the universe. In order to detect the expected flux of high energy neutrinosfrom specific astrophysicalsources, neutrino telescopesof a scale of a km3 of water will be needed. A Northern Hemispheredetector is being proposed to be sited in a deep area of the Mediterranean Sea. This detector will provide complimentary sky coverage to the IceCube detector being built at the South Pole. The three neutrino telescopeprojects in the Mediterranean (ANTARES, NEMO and NESTOR) are partners in an effort to design, and build such a km3 size neutrino telescope, the KM3NeT. The EU is funding a 3-year Design Study; the status of the Design Study is presented and some technical issues are discussed.