ancient underground tunnel with arched ceilings and eerie blue lighting, ai

underground tunnel arches eerie blue mysterious historical fantasy adventure glow lighting ancient architecture stone corridor exploration secret hidden passageway shadowy atmospheric moody enigmatic cavernous vaults cryptic labyrinth subterranean mystical haunting secluded dimlylit archedceiling historicalsite fantasysetting adventuretheme mysteriousatmosphere explorationtheme secretive intriguing ancientarchitecture ai generated