sing GROT-10 in Karmadon canyon.

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Full-wave signals (reflected). Circles mark signal from the boundary "the glacier - surface of the earth" (left graph) and strong signal, supposedly from the stop wall (right graph). Boundary "the glacier - surface of the earth" is located on the mark 980 ns on the right graph and 900 ns on the left graph (they are noted by pointers). Boundary is determined by an abrupt change in the nature of the signal.

Two profiles. In the initial part of profile 1 a strong signal from the object (depth 2m, size 1-2m) is observed. Repeated re-reflections of signal are observed which are characteristic either for the objects from the metals or for the voids. Large stone also can give such signal. Profile 2 is obtained from the area located on 7m above the area where profile 1 is obtained. At depth 64.5m of profile 1 a signal is noted, probably, from the boundary "ice - earth" (marked by dark-blue pointer). On profile 2 at depth 70m intensive signal is noted, supposedly from the stop wall next to the tunnel. Consequently, tunnel is located approximately at the same depth.