An apparatus comprising a cavity having interior surfaces or reflecting elements, one or more transmitters configured to receive an electrical signal, transform the electrical signal into an electromagnetic wave signal, and introduce the electromagnetic wave signal into an inside of the cavity, and one or more receivers configured to retrieve the electromagnetic wave signal, transform the electromagnetic wave signal to a corresponding electrical signal, and transmit the corresponding electrical signal to the outside of the cavity is disclosed. The electromagnetic wave signal is contained within the inside of the cavity until retrieved by undergoing a series of reflections or traversals between the interior surfaces of the cavity or the reflecting elements within the cavity. The apparatus may further comprise one or more regenerators configured to re-amplify, re-shape, and/or re-time the electromagnetic wave signal traveling within the inside of the cavity.