  The recent observations of 50 TeV gamma radiation by HEGRA have the potential
of determining the extragalactic flux of infrared radiation. The fact that
radiation is observed in the range between 30 and 100 TeV sets an upper limit
on the infrared flux, while a cutoff at $E_{\gamma} \approx 50$ TeV fixes this
flux with a good accuracy. If the intrinsic radiation is produced due to
interaction of high energy protons with gas or low-energy target photons, then
an accompaning high-energy neutrino flux is unavoidable. We calculate this flux
and underground muon flux produced by it. The muon flux is dominated by muons
with energies about 1 TeV and can be marginally detected by a 1 km$^2$ detector
like an expanded AMANDA.
