In this tutorial, we will show you how to create an underwater atmosphere effect inspired by the movie Aquaman using Adobe After Effects. Follow these steps to achieve this mesmerizing visual effect.

**Step 1: Prepare Your Footage**
If you are shooting your own footage, use cyan blue lighting and a smoke machine to create an underwater atmosphere. The light peeping through the smoke will create atmospheric rays. Alternatively, download the footage used in this tutorial to follow along easily.

**Step 2: Import Footage into After Effects**
Import your footage into Adobe After Effects and create a new composition. Begin by grading your footage to enhance the underwater effect.

**Step 3: Add Light Rays**
To add light rays, create a new solid layer and use the **Fractal Noise** effect. Adjust the settings to create a pattern that resembles light rays filtering through water. Change the blending mode of this layer to **Add** or **Screen** to blend it with your footage.

**Step 4: Animate Fish**
Download images or footage of fish and import them into your composition. Use the **Puppet Tool** to animate the fish, giving them realistic movement. Position the fish throughout your scene to add depth and realism.

**Step 5: Adjust Colors and Effects**
Use **Color Correction** effects such as **Curves** and **Hue/Saturation** to adjust the colors of your footage, enhancing the underwater atmosphere. Increase the cyan and blue tones to match the underwater look.

**Step 6: Add Bubbles and Particles**
Create a new solid layer and use the **CC Particle World** effect to generate bubbles and particles. Adjust the settings to create small, slow-moving bubbles that drift through the scene. Change the blending mode to **Screen** to blend the bubbles with your footage.

**Step 7: Apply Depth of Field**
Add a **Camera** layer to your composition and enable **Depth of Field**. Adjust the focus distance and aperture settings to create a realistic depth effect, blurring the background slightly and keeping the foreground elements sharp.

**Step 8: Final Adjustments**
Make final adjustments to the brightness, contrast, and color balance to ensure the scene looks cohesive. Add a slight **Vignette** effect to draw attention to the center of the frame.

**Step 9: Render and Export**
Once you are satisfied with the effect, render and export your composition. Make sure to review the final product to ensure all elements blend seamlessly and the underwater atmosphere is convincing.

For a detailed, step-by-step guide on creating the Aquaman underwater atmosphere effect using Adobe After Effects, watch the full video tutorial.