Possibility of Using a Satellite-Based Detector for Recording Cherenkov   Light from Ultrahigh-Energy Extensive Air Showers Penetrating into the Ocean   Water
  We have estimated the reflected component of Cherenkov radiation, which arises in developing of an extensive air shower with primary energy of 10^20 eV over the ocean surface. It has been shown that, under conditions of the TUS experiment, a flash of the reflected Cherenkov photons at the end of the fluorescence track can be identified in showers with zenith angles up to 20 degrees. 
O. P. Shustova, N. N. Kalmykov, B. A. Khrenov
astro-ph.IM astro-ph.HE