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2021 • 6 Episodes
Season 1 of Secrets of the London Underground premiered on July 19, 2021
2022 • 10 Episodes
Season 2 of Secrets of the London Underground premiered on May 5, 2022
2023 • 10 Episodes
Season 3 of Secrets of the London Underground premiered on July 4, 2023
2024 • 10 Episodes
Season 4 of Secrets of the London Underground premiered on July 2, 2024