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Sci-fi thriller

Deep (2021): Cast, Ratings & Plot

Deep (2021) movie poster

Deep is a 2021 sci-fi thriller directed by Adirek Wattaleela and Apirak Samudkidpisan, starring Bhumibhat Thavornsiri as Jade, Kay Lertsittichai and Dujdao Vadhanapakorn. It runs 1 hour 41 minutes. IMDb users rate it 5.3/10.

IMDb rating
5.3/10
Echo Score
45
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Deep (2021) movie poster
Released
Runtime
1h 41m (101 min)
Genres
Sci-Fi , Drama , Mystery , Thriller
Original language
Thai
Studio
Netflix
After the credits
No No extra scene
The story

What Is Deep About?

The premise of Deep without spoilers. The whole story is in the plot summary further down.

Four doctors struggling with insomnia participate in a neuroscience experiment designed to explore the depths of the human mind. As the trial progresses, they find themselves confronting their most profound fears and hidden secrets, which seem disturbingly connected to the experiment's design. Imprisoned within a complex and perplexing test environment, they must decipher the mystery before it overwhelms them and they become the experiment's next casualties.

Deep Themes & Keywords

· 27 tags
  • boyfriend girlfriend relationship
  • drowning
  • scuba diving
  • haunting
  • haunted house
  • house underwater
  • artificial lake
  • filmed with go pro
  • couple
  • house
  • running out of oxygen
  • diving
+15 more
  • trapped underwater
  • urban exploration
  • underwater scene
  • discovering a dead body
  • trapped in a building
  • catfish
  • urbex
  • flooded house
  • underwater drone
  • remotely operated underwater vehicle
  • female topless nudity
  • ghost
  • exiting through a chimney
  • woman in a bath
  • female nudity
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Cast & crew

Deep Cast & Characters

Bhumibhat Thavornsiri leads the cast as Jade, with Kay Lertsittichai as Win and Dujdao Vadhanapakorn as Professor Nichcha. Directed by Adirek Wattaleela, Apirak Samudkidpisan and Jetarin Ratanaserikiat; 10 actors are credited in all.

Also Starring in Deep

· 6 more
Ratings

Deep Reviews & Ratings

IMDb users rate Deep 5.3/10. Our Echo Score gives it 45/100, strongest in rewatch factor (50) and weakest in character & emotion (40).

45 /100

Deep Echo Score Breakdown

Deep strives to deliver a fresh underwater horror concept, but its execution repeatedly falls short. Critics note a lifeless atmosphere punctuated by only occasional suspense, while the script is described as cheesy and the pacing bizarre, leading to an unsatisfying payoff. Performances are widely criticized as forgettable, and technical choices such as erratic camera work and grating sound design further diminish immersion. Although the novelty of an underwater setting offers brief intrigue, the cumulative shortcomings result in a largely underwhelming experience.

Our own 0–100 rating, built from five aspects: art, character, story, the sensory experience and how well a film rewatches.

  • Art & Craft 45

    In terms of art and craft, the film’s underwater premise showcases ambitious production design and a setting that many viewers find visually striking. However, reviewers repeatedly cite erratic camera movements, excessive flashing lights, and jarring edits that disrupt continuity. The apparent budget constraints also lead to uneven visual effects. Consequently, the technical aspirations are undermined by inconsistent execution, leaving the overall craftsmanship below expectations.

  • Character & Emotion 40

    Regarding character and emotion, the acting is frequently described as flat and unconvincing, with leads delivering poorly written dialogue and making illogical choices. Reviewers label the male protagonist unlikeable and the female lead as inept, diminishing audience empathy. A minority of viewers note that vocal performances in the found‑footage format add modest depth, yet overall the character work fails to engage.

  • Story & Flow 45

    The story centers on a scientific sleep‑deprivation trial gone wrong, an idea that initially intrigues. Nevertheless, critics point to a cheesy script, clichéd horror tropes, and disjointed pacing that erode tension. The promised payoff is repeatedly labeled unsatisfying, with many feeling the plot collapses in its final act. Overall, narrative cohesion and originality are insufficient to sustain interest.

  • Sensory Experience 45

    Sensory experience is split between the claustrophobic allure of deep‑water visuals and problematic audio design. While the underwater setting creates an unsettling atmosphere praised for its originality, reviewers repeatedly complain about repetitive yelling, a grating soundtrack, and moments where darkness renders action indecipherable. These auditory issues, combined with confusing cinematography, dilute the intended immersive horror effect.

  • Rewatch Factor 50

    Rewatch factor appears low, as most commentators label the film disposable and suitable only for a single viewing. Some users, however, acknowledge the novelty of an underwater horror premise and find it watchable once for its unique setting. Nonetheless, the pervasive narrative and technical flaws limit lasting appeal, resulting in minimal incentive for repeat viewings.

Plot

Deep Plot Summary

What happens in Deep from start to finish, spoilers included, with a timeline of 15 key events. The opening is below; the full summary is a 3-minute read.

Spoilers ahead

Ben and Tina, a young engaged couple from New York and enthusiastic YouTube content creators, embark on an adventurous journey across Europe in search of reputedly haunted locations to document their thrilling exploits. One day, they make their way to south-west France, aiming to explore a sanatorium submerged beneath an artificial lake. However, to their surprise, they find the site bustling with vacationers. Thankfully, a local named Pierre offers to guide them to a secluded part of the lake, deep in the forest of Chanteloup. This area, which was intentionally flooded in 1984 to mitigate the risk of devastating floods, is rumored to house a mansion that, according to Pierre, has remained astonishingly intact.

Full summary

The whole story of Deep, scene by scene

Read the full summary
Videos

Deep Trailers & Videos

3 videos: 3 trailers.

Official Trailer [Subtitled]
  • Trailer Official Trailer
  • Trailer Official Trailer 2 | Tickets On Sale Now! [Subtitled]
Quiz

How Well Do You Know Deep?

9 questions about the story, each with a hint if you get stuck. Pick an answer to see whether you were right.

Question 1 of 9

  1. Question 1: not answered
  2. Question 2: not answered
  3. Question 3: not answered
  4. Question 4: not answered
  5. Question 5: not answered
  6. Question 6: not answered
  7. Question 7: not answered
  8. Question 8: not answered
  9. Question 9: not answered

What drove Ben and Tina to explore the abandoned sanatorium?

Cars

Cars in Deep

21 cars on screen, including the Ford Bronco and the 2000 Subaru Outback.

All 21 cars
  • Ford Bronco in Deep Ford Bronco Important role
  • 2000 Subaru Outback in Deep 2000 Subaru Outback Important role
  • 2016 Tesla Model X in Deep 2016 Tesla Model X Important role
  • 2004 BMW 6 E64 in Deep 2004 BMW 6 E64 Minor role
Details

Deep Also Known As

9 alternative titles, including “deep sabi” and “Tận Sâu”.

Also known as
  • deep sabi
  • Tận Sâu
  • 딥: 잠들면 죽는다
  • 安眠实验
  • 安眠實驗
  • Sueño mortal
  • Омут
  • DEEP: 覚醒ゲーム
  • 失眠求生戰

Seen Deep?

FAQ

Deep FAQ: Cast, Runtime & Release Date

Runtime, release date, director, cast, ratings, post-credit scenes and language of Deep, each answered in a sentence.

How long is Deep?

Deep runs 1 hour 41 minutes (101 minutes).

When was Deep released?

Deep was released on July 16, 2021.

Who directed Deep?

Deep was directed by Adirek Wattaleela, Apirak Samudkidpisan and Jetarin Ratanaserikiat.

Who is in the cast of Deep?

Deep stars Bhumibhat Thavornsiri as Jade, Kay Lertsittichai as Win and Dujdao Vadhanapakorn as Professor Nichcha, among 10 credited actors.

How is Deep rated?

Deep has 5.3/10 on IMDb, 77% on TMDB, 2.5/5 on Letterboxd and 3.3/5 on Movie Insider.

Does Deep have a post-credit scene?

No. Deep has no extra scene during or after the credits.

What language is Deep in?

The original language of Deep is Thai.

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