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 .