Like underwater communication (covered last month), communicating underground such as in mines or tunnels can be quite tricky. There are various techniques like using repeaters, mesh networks or ground-penetrating low-frequency radios. This article covers all that and more. by Dr David Maddison
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afternoon this press conference might be called to announce democrats might be deciding to hold a vote on the house floor to formally announce an impeachment inquiry. republicans, the white house certainly have been saying there needs to be in their view an official vote on the house floor for that. i take it based on what we re not hearing in those first ten or so minutes, that is not the plan. there is not going to be at least for now a vote to authorize an inquiry, is that correct? good evening, steve. we believe we are in a formal impeachment inquiry. and in the history of investigations no investigator has ever allowed a suspect to dictate the terms and direction and time line of an investigation. we re not going to let donald trump do that. so we re going to continue to proceed. in the last three weeks we ve heard from a number of witnesses. the time line is becoming clearer and who was in the shadow steam loop and outside the loop is also coming into focus. the reporting fro