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The Underwater Realm

Thousands of years ago, the world's most advanced civilisation sank beneath the waves, its people forever doomed to wander the ocean floor. is the story of the five times those on the surface have caught a glimpse below: freediving off the coast of modern Hawaii, a downed pilot at the height of World War II, amidst the smoke and fire of the Spanish Armada, a suicidal girl in medieval England, and finally, at the height of Roman Power in 149 BC.

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Genre:

Documentary, Short

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Safe/legal ways to watch The Underwater Realm

Subscription platforms: Netflix, Disney+, Amazon Prime Video, Apple TV+, HBO Max/Max (region-dependent), Viu.
Ad‑supported legal services: Tubi, Pluto TV, Crackle, Peacock (where available).
Rent or buy: Google Play Movies, Apple iTunes, Amazon.
Library & public options: Kanopy, Hoopla (free with many library cards or universities).
Official YouTube channels: Some studios and distributors post full films legally.

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