| Question 1: In 1994, the leader of an ________ group, the Diggers of the Underground Planet, claimed to have stumbled on an entrance to this underground system [2]. | |||
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| Question 2: The system was built supposedly during (or from) the time of Stalin and codenamed D-6 by the ________[1]. | |||
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| Question 3: Metro-2 in ________, Russia is a purported secret underground metro system which parallels the public Moscow Metro. | |||
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| Question 4: Russian journalists have reported that the existence of Metro-2 is neither confirmed nor denied by the Federal Security Service of the Russian Federation (FSB) or the ________ administration. | |||
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