Tech'Stuff

Map : The shaded grayscale version you can see of the terrain is the version used in Unity. The last step, the alpha clip, is done in the shader to obtain multiple steps using a single texture.

Submarine drawing : The design of the submarine is based on a simple screenshot of the 3D object.
I then used different treshold values and a paterne to bring out the shadows.
Video : https://imgur.com/cxFQQbK
The drawn side is done in Unity, with a secondary camera that renders this texture when the page changes. This allows me to add an inked side via a shader. (The same method is used for the terminal monitor)

Water : The water is made with textures in Substance Designer and a very simple Gestetner Wave shader.
I didn't feel the need to go any further, given the camera's point of view.
For the boat to sync to the waves, it simply executes exactly the same code as the shader in C#. With 3 points it can determine its position and orientation.
Video : https://imgur.com/XDEZXvQ

https://i.imgur.com/XDEZXvQ.mp4

Audio Ticket : Nothing special, except that it was made in less than 30 minutes in Substance Designer and was a real pleasure!
Video : https://i.imgur.com/TkyaJQH.mp4