Underwater voice communication devices and associated methods are described. The guide-on post assemblies each include a rectilinear upwardly extending support bar 38 that defines a longitudinal slot 50, and a buoyant guide-on post 44 is telescopically mounted downwardly about the support bar 38 and defines a laterally extending connector opening 52 that registers with the longitudinal slot. The increase of the gap size can be prevented by bonding the pillars to the components of the microstructure. The electronic file is not transmitted from the communications device to the communications node.