How to Make Viral AI BTS Movie Videos with a Tsunami in Google Flow

Have you seen those viral AI videos that look like behind-the-scenes footage from a huge disaster movie? They show film crews working on miniature sets while massive waves, explosions, or other disasters happen right in front of the camera.

The crazy part is that you don't need an actual movie studio to create this kind of video.

With Google Flow, you can turn a detailed prompt into a cinematic AI video that looks like a real movie production set. Google describes Flow as an AI filmmaking tool designed for creatives and powered by its advanced Veo, Imagen, and Gemini models. It is built to help creators produce cinematic clips and scenes from natural-language prompts.

In this tutorial, we'll focus on creating an AI BTS movie production video featuring a massive tsunami hitting a miniature location.

The idea is simple: instead of showing the disaster like a normal movie scene, we make the video look like someone from the production crew is recording the filming process with a phone.

Let's get started.

Step 1: Get and Customize the Prompt

The first thing you need is the prompt.

The prompt is responsible for telling the AI what the camera should see, how the miniature set should look, what happens during the video, how the water behaves, and even how the production crew should sound.

I've prepared the prompt below so you can copy it and use it for your own project.

Before using it, there is one important part you need to customize.

Look for:

“Miniature ”

Replace with the location you want to create.

For example, you could use:

Miniature Miami Beach

For this example, let's use Miami Beach because it works really well with the tsunami concept. You can also experiment with other locations such as a harbor, tropical resort, coastal city, amusement park, or even a fictional movie set.

Once you've replaced the placeholder, copy the complete prompt.

The AI BTS Tsunami Video Prompt

Vertical 9:16 handheld phone video, 15 seconds, one unbroken take, no cuts.

Close, high, looking down onto a miniature beach. Pale sand with tiny palm trees on the left, water on the right. Miniature Miami Beach — At the very bottom of the frame, the back of a man's head and shoulders in a black "EFFECTS CREW" t-shirt, cropped by the frame edge, very close to the lens. A black crane arm hangs into the upper left corner.

0–2s — Water flat and still. An unseen voice calls out across the stage, echoing: "…and — ACTION!"

2–4s — A heavy mechanical release: pneumatic clunk, metal latch dropping, deep hydraulic groan, rising rush of displaced water. A swell forms and rolls toward the pier.

4–9s — The wave breaks over the pier. Loud rushing whitewater. Over the roar, shouted instructions: "Camera three — close on the wheel!" Whitewater surges through the pier deck, palm trees submerge, buildings tear loose and float.

9–13s — The surge pours over the near concrete lip onto wet stage floor. Water slapping concrete. A shout: "Back up! Back up!" Boots splashing. The camera drifts right and tilts down to follow the water over the edge.

13–15s — Water noise drops to draining and dripping.

Miniature-scale water — small fast droplets, tight foam, visible surface tension. All voices off-screen, no speaking face, no lip-sync. Live production sound, large room reverb, no music. Handheld shake, natural light, no grade.

Negative: centered, symmetrical, vanishing point, wide shot, establishing shot, eye level, full body visible, ceiling, lighting truss, static camera, music, score, voiceover, narrator, visible speaking face, lip sync, subtitles, cut, scene change.

Why This Prompt Works

The interesting thing about this prompt is that it doesn't simply tell the AI to make a tsunami.

Instead, it creates the feeling of real behind-the-scenes movie footage.

For example, the prompt adds an “EFFECTS CREW” shirt at the bottom of the frame and a camera crane in the corner. These small details make it obvious that we're looking at a movie set rather than a normal disaster scene.

The prompt also tells the AI to use a handheld phone perspective. This helps create a more casual and believable BTS look instead of making the video feel like a perfectly composed Hollywood shot.

Another important detail is the timeline.

The first two seconds are calm. Then the mechanical system activates, the wave begins moving, the tsunami hits the miniature set, and finally the water starts draining away.

That progression gives the video a clear beginning, buildup, payoff, and ending.

The sound instructions are also important. Instead of adding background music, the prompt describes production sounds, water, mechanical equipment, crew instructions, and room reverb.

Google has highlighted Flow's ability to work with cinematic prompting, camera control, ingredients, and other filmmaking-focused workflows.

Step 2: Generate the Video

Once your prompt is ready, it's time to create the video.

Open Google Flow and access the video-generation workspace. Flow is designed as a creative studio for AI video and filmmaking, although available features can vary depending on your subscription tier, platform, and region.

Create a new project and select the video-generation workflow available in your account.

For this tutorial, use a portrait 9:16 format so the result is suitable for vertical platforms such as YouTube Shorts, TikTok, and Instagram Reels.

Paste the customized prompt into the prompt field and start the generation.

The goal is to let the prompt control the entire sequence as one continuous shot. Avoid adding unnecessary scene changes because the original concept is based on a single handheld BTS recording.

Once the generation finishes, review the result carefully.

Pay attention to the tsunami motion, miniature scale, crew member in the foreground, camera movement, water physics, and the overall BTS atmosphere.

Make Your Own Version

One of the best things about this concept is that you're not limited to Miami Beach.

You can replace the location with almost anything.

Try something like:

Miniature Tokyo street

Miniature tropical resort

Miniature New York waterfront

Miniature harbor

Miniature theme park

Miniature coastal village

The location can completely change the visual story while keeping the same BTS filmmaking concept.

You can also experiment with different disasters. A tsunami is a great starting point because water creates a lot of movement, but the same structure could potentially be adapted for other cinematic scenarios.

The key is to maintain the BTS elements: a handheld camera, visible production equipment, partial crew members, off-screen instructions, practical-effects details, and a continuous recording style.

Step 3: Watch the Video Tutorial

Reading the prompt is helpful, but seeing the entire workflow on screen can make the process much easier to follow.

I've also prepared a video tutorial that walks through the process of creating this type of AI BTS movie production video.

Watch the tutorial here:

You can follow along with the video while preparing your own prompt and generating your first scene.

Final Thoughts

Creating an AI BTS movie video doesn't have to be complicated.

The biggest trick is to think beyond the main disaster itself. Don't just ask AI to generate a giant tsunami. Build the entire filmmaking environment around it.

Add the miniature set.

Add the crew.

Add production equipment.

Add realistic camera movement.

Add practical sound effects.

Then let all of those elements work together in one continuous shot.

That's what makes the result feel less like a random AI animation and more like secret behind-the-scenes footage from a blockbuster movie.

So start with Miami Beach, generate your first tsunami scene, and then try completely different miniature locations.

You might be surprised by how creative these AI movie-production videos can become.