Extended tutorial (step by step):    • Blender Underwater Scene Extended Tut...  
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In this video, we're creating realistic underwater scenes in Blender.

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Shark model I used: https://skfb.ly/6TzOM
Polyfjord's caustic tutorial:    • Discovering Fake Caustics in Blender  

Chapters:

0:00 - Intro
0:15 - The Idea
0:40 - Set Up Ocean
1:13 - Ocean Lighting
1:57 - Volumetrics
2:32 - Set up Caustics
3:41 - Set up Particles
4:20 - watch this next