Underground Waterfall, Michael Ghelfi

The Underground: A Sam & Fuzzy RPG by Damocles Thread Development — Kickstarter

Mendel Palace — Front cover (by Geof Darrow) and some interior

A battlemap of a underground steampunk train station for a tabletop rpg inspired by alphonse mucha

Cloud Underground Incubator: The RPG of Life

Age of Ravens: History of Cyberpunk RPGs (Part Two: 1993-1994)

Underground on Steam

A Place, Underground – L.F. OSR

Underground Mine & Assets

My next game is a turn based RPG about a young child lost in an underground sewer system where strange fog is mutating the creatures and critters inhabiting the labyrinth : r/Unity2D

Best Underground Games