: a group of people who secretly work to oppose or overthrow a government
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Police say that there is no threat to the public, and that the sewer systems have been investigated after the unknown individuals spent hours in the underground tunnels.—Amethyst Martinez, USA Today, 3 June 2026 There have been no new signs indicating where the missing miners are in the underground labyrinth of narrow tunnels, Cuesta told ABC News on Wednesday morning.—Aicha El Hammar Castano, ABC News, 3 June 2026 Photos released by the FGR appear to show agents navigating the underground passageway, access points leading into the tunnel and evidence recovered during the operation.—Greg Wehner, FOXNews.com, 2 June 2026 While that’s the face of professional competition, players will also take part in the underground Midnight Collective, which appears to be focused more on street racing.—Gieson Cacho, Mercury News, 2 June 2026 See All Example Sentences for the underground