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