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.
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