Journey to the Center of the Earth the center of the Earth. The travellers are swept away as the sea rushes into the large open gap in the ground. After spending hours being swept along at lightning speeds by the water, the raft ends up inside a large volcanic chimney filling with water and magma. Terrified, the three are rushed upwards, through stifling heat, and are ejected onto the surface from a side-vent of a stratovolcano. When they regain consciousness, they discover that they have been ejected from Stromboli, a volcanic island located in southern Italy. They return to Hamburg to great acclaimProfessor Lidenbrock is hailed as
Through-the-earth mine communications Through-the-earth mine communications Through-the-Earth (TTE) signalling is a type of radio signalling used in underground mines and caves that uses low-frequency waves to penetrate dirt and rock, which are opaque to higher-frequency conventional radio signals. In mining, these lower-frequency signals can be relayed underground through various antennas, repeater or mesh configurations, but communication is restricted to line of sight to these antenna and repeaters systems. Through-the-Earth transmission can overcome these restrictions by using ultra-low frequency (300–3000 Hz) signals, which can travel through several hundred feet of rock strata. The antenna cable can be located on the surface only at a