# Where to watch The Mystery Beneath (2015) in the UK

> The Mystery Beneath (2015) is available to watch free in the UK on Plex. Last verified on 16 May 2026 by ScreenSearch.

**Type:** Film  
**Year:** 2015  
**Runtime:** 58 minutes  
**Genres:** Documentary  
**Region:** United Kingdom (GB)  
**Last verified:** 16 May 2026 (2026-05-16T10:30:00.052Z)  

## Synopsis

A group of treasure hunters discover a mysterious object at the bottom of the Baltic Sea in this documentary. Theories abound about the large object's origins. It might be a UFO, manmade, or it might be a naturally occurring phenomenon. Nobody knows.

## Streaming options in the United Kingdom

### Free (with ads or TV licence)

- [Plex](https://www.themoviedb.org/movie/404855-the-mystery-beneath/watch?locale=GB)

## Frequently asked questions

**Where can I watch The Mystery Beneath for free in the UK?**

The Mystery Beneath (2015) is available free (with adverts or a TV licence) on Plex in the United Kingdom.

**Is The Mystery Beneath on Netflix, Disney+ or Amazon Prime Video in the UK?**

The Mystery Beneath is not currently included with any major UK subscription service. It may still be available to rent or buy.

**How accurate is this film's availability data?**

Availability is sourced from The Movie Database (TMDB), which in turn pulls from JustWatch. Listings are refreshed daily. For purchase decisions, the provider's own site is the source of truth.

## Sources

- Streaming availability: The Movie Database (TMDB), refreshed daily.
- Underlying licensing data: JustWatch.
- Canonical URL: https://www.screensearch.co.uk/watch/movie/404855/the-mystery-beneath-2015
- Poster image: https://image.tmdb.org/t/p/w500/6xZolx8iZd8lwCBnJ0b0nHg9wOk.jpg
- JSON variant: https://www.screensearch.co.uk/watch/movie/404855/the-mystery-beneath-2015.json

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Generated by [ScreenSearch](https://www.screensearch.co.uk/) — a free UK-focused tool that answers "where can I watch this in the UK?" for any film or TV show. No accounts, no signup.