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We consider the guaranteed physics of horizontal (hadron) air-showers, HAS,developing at high (tens km) altitudes. Their morphology and information tracesare different from vertical ones. Hundreds of km long HAS are often split bygeomagnetic fields in a long (fan-like) showering with a twin spiral tail. Thehorizontal fan-like airshowers are really tangent and horizontal only at Northand South poles. At different latitude these showering plane are turned andinclined by geomagnetic fields. In particular at magnetic equator such tangenthorizontal East-West airshowers are bent and developed into a vertical fanair-shower, easily detectable by a vertical array detector (hanging elements bygravity). Such "medusa" arrays maybe composed by inflated floating balloonschains. The light gas float and it acts as an calorimeter for the particles,while it partially sustains the detector weight. Vertically hanging chains aswell as rubber doughnut balloons (whose interior may record Cherenkov lights)reveal bundles of crossing electron pairs. Such an array maybe loaded at bestand cheapest prototype in common balloons tracing upward and tangent hadronair-showers from terrestrial atmosphere edge. These array structure may revealthe split shower signature. Better revealing the composition nature. Justbeyond the Earth horizons there are exciting, but rarer, sources of upwardairshowers: the new UHE Tau Air-showers astronomy originated within Earth byEeVs tau neutrino signals skimming the soil and forming UHE Tau, decaying laterin flight. Therefore Horizontal airshowers at equator may show the hadronhorizontal twin split nature, its composition as well as a very first expectedUHE Neutrino astronomy.

Vertical Array in Space for Horizontal Air-Showers