The Erlangen astroparticle groups participate in three Cherenkov neutrino detectors that are or will be located deep in the Mediterranean Sea or the Antarctic ice. The ANTARES detector off the French coast was finished in 2008, while its successor, the cubic-kilometre neutrino telescope KM3NeT, is currently under construction. The IceCube neutrino telescope was completed in 2010 and instruments a volume of 1 cubic-kilometre of clear ice below the geographic South Pole. It opened the window to neutrino astronomy by the first detection of high energetic cosmic neutrinos. Plans for an extention of the detector towards IceCube Gen2 are in preparation.