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captain tim taylor is a specialist and president of subsea service. steve wallace is former director of federal aviation administration office of accident investigation. miles o berry scene a cnn aviation analyst. gentlemen thanks for being here. tim i want to start with you. we know this frequency came in at 33.3 kilohertz lower than the standard 37.5. does that rule out that this is possibly from the black boxes? no not necessarily. the battery strength water is a very diffuse medium and full of layers of temperature and pressure gradients that can distort and reflect this, so i think that it is in the range. these manufacturers always say that they are plus or minus on the range as well so not always right dead on. and if you factor all that in