Here's what helps Into The Abyss work behind the scenes.
Gaia
This project uses the popular procedural terrain generator known as Gaia for all levels used into the game. Gaia enables the project to have a realistic, vast setting to make the game more enjoyable and believable for players. Not only that, but it saves the developers a lot of work.
(Check out more at https://www.procedural-worlds.com/products/indie/gaia/)
Blender
3D modeling is used for a more custom experience with care given to detail. Blender was the most effective option to craft items such as control panels and disc players, while enabling high-quality, material-specific textures to help paint the underwater caverns.
Unity and C#
The main development engine that powers Into the Abyss is Unity. It's drag-and-drop UI removes a lot of drag of designing levels. Dozens of animations are timed and created with Unity's excellent animation controllers. C# scripts written to track submarine health, give monsters AI and manage voice acting files are also integrated with the easy-to-use graphical system of Unity. This project is dependent on C# and it's many scripts to keep the Into the Abyss playing like a proper game