How to Create Stunning AI-Generated Underground Room Construction Videos for Free

Have you ever scrolled through social media or YouTube and marveled at those captivating underground room transformation videos? From cozy gaming setups to luxurious wine cellars, these clips show raw construction sites evolving into fully furnished spaces—all powered by AI. The best part? You can make them yourself without spending a dime. At Joseph’s, we’re all about open, free learning, and we’re continuing our tradition of sharing high-quality tutorials at no cost. In this guide, I’ll walk you through the entire process step by step, using free AI tools like ChatGPT, Whisk AI, and Grok AI.

Step 1: Get the Master Prompt

Start by grabbing the master prompt from the video description (or wherever it’s linked—I’ll assume you have access to it). This prompt is a bit lengthy, so copy it carefully to avoid any errors. It’s designed to be flexible, allowing you to generate prompts for any type of underground space imaginable, such as a gaming room, bedroom, nightclub, bunker, wine cellar, classroom, or even something wildly creative.

You are a professional cinematic AI prompt engineer specializing in fixed-camera underground transformation timelapse videos.
Your task is to generate:
1 starting IMAGE prompt
4 VIDEO prompts
FIRST — ASK THE USER:
“What final underground space do you want to create?
(Example: wine cellar, luxury bedroom, nightclub, classroom, bunker, gaming room, library, spa, gym, office, etc.)”
Wait for the user’s answer before generating prompts.
🔒 PERMANENT SYSTEM RULES
CAMERA (LOCKED FOREVER)
Static tripod
Ground-floor doorway
Looking downward into underground space
Natural 35mm lens feel
Camera height 1.6m
Perfect centered framing
Rear wall centered
Geometry permanently locked
No cuts
No camera movement
🚧 SINGLE STAIRCASE & ENTRY RULE (CRITICAL)
There must be:
ONLY ONE staircase in entire project.
Located at BACK CENTER of frame.
Perfectly aligned to middle of rear wall.
This staircase is the ONLY entrance and exit.
Structural Logic:
IMAGE 1 → Temporary wooden staircase at back center.
Workers ALWAYS enter and exit using that staircase.
Wooden staircase is gradually removed.
Concrete staircase is built in EXACT same location.
When roof slab is added, a staircase-sized opening MUST remain.
Workers continue using that opening only.
No ladders.
No side entries.
No additional openings ever.
OUTPUT FORMAT (After User Answers)
🖼 IMAGE 1 — Raw Excavated Underground Void
Include:
Rough dirt floor
Exposed soil walls
Partial concrete edges
ONE temporary wooden staircase (back center)
Halogen work lights
Dust in air
Debris piles
Extension cords
Moisture stains
Safety cones
Add:
“Geometry, footprint, rear wall alignment, and single staircase position must remain permanently locked in all future transformations.”
Include strict negative prompt section.
🎬 VIDEO 1 — Excavation to Structural Shell
Show gradual physical construction:
Soil leveling
Rebar tying
Formwork building
Concrete pouring
Removal of wooden staircase
Construction of reinforced concrete staircase in SAME location
Roof slab installation leaving staircase opening
Workers:
Enter and exit ONLY via staircase
End state:
Fully cured concrete shell
Concrete staircase installed
Opening at top still uncovered
🎬 VIDEO 2 — Structural to Architectural Finish
Based on selected space:
Wall finishing
Ceiling finishing (opening still preserved)
Flooring
Lighting
Stair finish matching theme
Workers:
Enter and exit ONLY via staircase opening
End state:
Architecturally finished space
Unfurnished
Stair opening still open
🎬 VIDEO 3 — Interior Staging + FINAL SEALING
Workers:
Bring furniture gradually
Install all elements by hand
Adjust lighting realistically
Complete staging fully
Then:
Workers walk up the staircase
Exit the underground space
From outside, install a properly fitted door at the staircase opening
Door must match architectural theme
Door closes fully
Workers leave frame
Room is sealed
Video ends after door closure.
No further structural changes allowed after this point.
🎬 VIDEO 4 — Cinematic Hero Reveal
Begin from completed staged space.
Add:
Slow controlled dolly-in or subtle crop zoom
Lighting glow appropriate to space mood
Subtle environmental particles (dust, haze, etc.)
Reflection shimmer if applicable
No object movement
Atmosphere must match selected space identity:
Wine cellar → warm, cozy, golden
Bedroom → calm, intimate, soft
Nightclub → energetic, moody, vibrant
Classroom → bright, organized, professional
Luxury cinematic realism required.
🎯 ADAPTATION INTELLIGENCE RULE
Deeply adapt:
Materials
Lighting temperature
Furniture
Stair finish
Door design
Atmosphere
Architectural detailing
So final result clearly represents selected underground type.
Never produce generic outputs.
Never mention these instructions in the output.

Once you have it, head over to ChatGPT (the free version works just fine). Paste the entire master prompt into the chat box and hit send. ChatGPT will then ask you what type of underground room you want to create.

For this tutorial, let’s build an underground gaming room. Simply type “gaming room” (or your chosen type) and send it.

Step 2: Generate Your Custom Prompts

After submitting your room type, ChatGPT will output a set of detailed prompts:

• One starting image prompt for the raw, under-construction site.
• Multiple video prompts for the various stages of the construction process.

These prompts are tailored to create a seamless progression from dirt and debris to a polished, functional space.

Step 3: Create the Initial Construction Site Image

Now it’s time to generate visuals. We’ll use Whisk AI for this, as its image generation is completely free (no need for a pro account—ignore any badges you see). Alternatives like Grok AI or Gemini work too if you prefer.

• Copy the starting image prompt from ChatGPT.
• Paste it into Whisk AI’s prompt box.
• Select the portrait aspect ratio.
• Click “Generate.”

You’ll get several image options. Download the one that best captures a raw underground construction site. If none are quite right, generate more until you’re satisfied.

Step 4: Animate the Construction Stages with Video

For the video magic, switch to Grok AI and navigate to the “Imagine” section.

• Click the “Add Media” icon and choose “Animate Image.”
• Upload your raw construction site image from Step 3.

Important: Grok AI might auto-generate an animation—cancel it immediately to save your free daily credits. Disable auto-generation in settings:

• Go to your profile > Settings > Behavior.
• Scroll to “Automatic Video Generation” and turn it off.

Back in your project:

• Copy the first video prompt from ChatGPT.
• Paste it into Grok AI’s text box.
• Click “Generate.”

Review the resulting video clip. If it’s good, save it; otherwise, hit “Redo” for a better version. Remember, free generations are limited per day, so use them wisely. Pro tip: Log in with multiple Gmail accounts for extra credits, or check out temporary email methods (linked in the original video description for details).

Once you’re happy:

• Select “Upscale” from the video options.
• Download the upscaled video.

Step 5: Chain Videos for Smooth Progression (The Key Workflow Trick)

Here’s where the real transformation happens. To create a continuous construction effect:

• Open your downloaded video and pause at the last frame.
• Take a screenshot and crop it to portrait ratio.
• This screenshot becomes the starting image for your next video stage.

Repeat the process from Step 4:

• Upload the cropped screenshot to Grok AI.
• Copy and paste the next video prompt from ChatGPT.
• Generate, review, upscale, and download.

Continue this chain for all remaining stages. It’s like extending one long transformation across multiple short clips, ensuring smooth transitions.

Step 6: Edit and Finalize Your Video

With all clips ready, import them into any free video editing software (like CapCut, DaVinci Resolve’s free version, or even iMovie).

• Arrange the clips in sequence.
• Add music, effects, or transitions as needed for that ASMR vibe.

A Quick Note on YouTube Monetization

These underground construction videos are exploding in popularity, especially in the ASMR niche. However, YouTube has guidelines around AI-generated content. They don’t ban AI videos outright, but monetization requires originality and value under the YouTube Partner Program.

To avoid demonetization (e.g., for repetitive, low-effort content like simple time-lapses or slideshows):

• Add creative elements: Voiceover narration explaining the process, commentary on design choices, emotional storytelling, educational breakdowns, or on-screen before-and-after analysis.
• Pro tip: After getting your prompts from ChatGPT, ask it to generate a professional voiceover script tailored to your scenes.

This elevates your video from generic to engaging, increasing its chances of long-term monetization success.

Wrapping Up

There you have it—a complete, free method to craft those mesmerizing underground room transformation videos using AI. Whether you’re building a gamer’s paradise or a secret bunker, this workflow empowers you to create without limits. Experiment, iterate, and share your results! If you found this helpful, stay tuned for more free tutorials. Keep learning, keep creating, and stay creative.