Internet censorship exists in several of the countries we work in, ranging from the Maldives to Sri Lanka. While censorship is not our focus, our readers may find this story on how Chinese Internet users tunnel through the great firewall of interest. The Great Firewall of China is hardly impregnable. Just as Mongol invaders could not be stopped by the Great Wall, Chinese citizens have found ways to circumvent the sophisticated Internet censorship systems designed to restrict them. They are using a variety of tools to evade government filters and to reach the wide-open Web that the Chinese government deems dangerous — sites like YouTube, Facebook and, if Google makes good on its threat to withdraw from China, Google.