  The ANTARES detector is the most sensitive neutrino telescope observing the
southern sky and the world's first particle detector operating in the deep sea.
It is installed in the Mediterranean Sea at a depth of 2475 m. As an example of
early results, the determination of the atmospheric muon flux is discussed and
a good agreement with previous measurements is found. Furthermore, the results
of a search for high-energy events in excess of the atmospheric neutrino flux
are reported and significant limits are set on the diffuse cosmic neutrino flux
in the multi-TeV to PeV energy range. Using data from more than 800 days of
effective data taking, partly during the construction phase, a first analysis
searching for point-like excesses in the neutrino sky distribution has been
performed. The resulting sensitivity of ANTARES is reported and compared to
measurements of other detectors. A method employed for a first search for
neutrinos from Fermi-detected gamma-ray flaring blazars in the last 4 months of
2008 is described and the results are reported. No significant neutrino signal
in excess of that expected from atmospheric background has been found.
