Ключевые слова: adventure, arc, architecture, blue green, brick, curve, dark, darkness, deep, drone view, empty, enigmatic, flooded railway track, historic, inside, inside tube, inside tunnel, long tunnel, mysterious, mystery, nobody, old, rail, railroad, railroad track, railway track, railway truck, railway tunnel, rock, round, see through, shadow, stone, stones, subway, technology, transport structure, transportation, travel, underground, urban, water, water in tunnel,