David Mirs News Today

From. >> acoustic energy, sound through the water, is greatly affected by time, pressure, and salinity. >> reporter: if "ocean shield" hear hears another ping and is able to fix the position, it will put blue fin 21 into the water and attempt to find wreckage on the sea floor. if wreckage is located, one aspect may work in investigators favor. very low temperatures. >> cold temperatures does preserve things better than a shallower, warm temperatures. >> reporter: the search continues. >> and wha...