Youtube video series of some underground tunnels/corridors with creatures and scientists in - Rendered with photo realistic CGI

[NeilF]

I'm trying to find some cult like videos done on YT of a mysteries set of tunnels underground with strange things go on. All done with photo realistic CGI. Anyone able to point me to the series of videos?

A lot of it done from a first person walking around POV.

 

[NeilF]

Yes! That's it! Thanks - https://www.youtube.com/watch?v=H4dGpz6cnHo

 

[NeilF]

This one?

Nothing that horrific!