An episode from the "Mystic Tube" series continues the same simple basic plot of “a pilgrim passes through a tunnel, playing music as he makes his way to his destination”. This work shares the same technique and form as AN ACID FIELD or WILD SHAMAN MAIDEN described above, but its theme is limited to “the changes in the echo of a sound as its mix in the dark as the harmonies of the drone made by a chanting pilgrim and its harmonic overtones evolve inside the 650meter tunnel with its reverberations that last more than 10 seconds.