  Upward and Horizontal Tau Air-showers (UPTAUS and HORTAUS) emerging from the
Earth crust, mountain chains or deep plate boundaries are the most powerful
signals of Ultra High Energy UHE anti neutrinos electron at PeV and neutrino
and anti-neutrino tau at energies near and above 10^15-10^19 eV. The large tau
Air-showers multiplicity N in secondaries N_opt =10^12 E_tau/ PeV, N_gamma=
10^8 E_tau/PeV, N_{e^- e^+}= 2 10^7 E_tau/PeV, N_mu = 3 10^5 E_tau/PeV^{0.85},
make easy their discover. UHE nu_tau, nu_tau because neutrino flavor mixing,
nu_mu <--> nu_tau, should be as abundant as nu_mu, bar-nu_mu. Also bar{nu}_e,
near the Glashow W resonance peak, E_bar{nu_e}= M^2_W / 2m_e = 6.3 10^{15} eV,
may generate tau Air-showers. The HORTAUS may test the UHE neutrino
interactions leading to additional fine-tuned test of New TeV Physics in
Mountain Valleys and Earth crust horizontal edges. UPTAUS or HORTAUS, beaming
toward high mountains, air-planes, ballons and satellites should flash gamma,
muon, X and Cherenkov lights toward detectors. Such UPTAUS might already hit
nearby satellite GRO gamma detectors flashing it by short (millisecond), hard,
diluted gamma-burst at the edge of BATSE threshold. We claimed their identity
with the observed BATSE 78 Terrestrial Gamma Flashes (TGF). The TGF clustering
toward Galactic Center and Plane, known AGNs source strongly support their UHE
Tau neutrino origin.
