. "Underground Continent"@en . "Cut off from the surface world until Unicron's attack in 2005, the Cybertron Underground refers to the cities of Markon, Accerix, and Darkreach."@en . . "Cybertron Underground"@en . . "Cybertron Underground"@en . . "Cut off from the surface world until Unicron's attack in 2005, the Cybertron Underground refers to the cities of Markon, Accerix, and Darkreach."@en . "Cybertron"@en .