Finding your next obsession
Finding your next obsession

Uncovers the extraordinary worlds lying just below modern urban centers. Beneath the streets of stone, soil and concrete exist hidden realms shaped by survival, ritual and imagination. Uncovers the extraordinary worlds that exist beneath major urban centers, from the tombs and wartime shelters of Naples to the manmade Royston Cave in Hertfordshire, England.
LUXEN Decision Guide
A real-world series choice where the subject and the perspective behind it are the main reason to keep going.
Best fit
Who it is for
Best suited to viewers who want a longer-form story built around real people, events, or ideas.
Commitment
Compact commitment · 10 episodes
Use the season and episode count to judge how much time you want to invest.
Start here
Read the synopsis.
Read the synopsis first; the contained season makes it easier to judge whether the full story fits your time.
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The series
10 episodes
2026