Go Forth!

1934. World War I never ended. You are a convict. Good Luck 
Decend by yourself or with friends down into the old fighting tunnels under the front lines of France. Search for old equipment and complete objectives for king and country… but mostly to keep the oxygen pumps on. 
Exploration
The underground tunnels caves and mines of France have expanded over years of stalemate warfare. There are seemingly endless routes and floors all with a mix of handmade and generated levels to search through.
Patchwork Parts
As you explore you might find old equipment from past combat, use these tools to aid your exploration, set traps, and create elaborate explosive arrays. Items do break but don't worry there are plenty of resources down there for you.
Find Friends and Expand Your Base
Not everyone underground is out to get you. Sometimes you might find someone willing to return to your home base. They can provide services from fixing your gear to uncovering special missions for your team to embark on.
Go on Crazier Missions 
You may find as you journey further and further down that things change… low light and a lack of oxygen can really make you see some strange things. 
Crafted or Chaos
With a highly destructible environment and lots of tools at your disposal, you could set out a structured plan of attack or just go with your guns…literally. Both strategies are workable, but you may need to communicate with your team before you run in.