All painted from scratch in Photoshop.
Text: Mining Networks...
Over the decades, Earth’s natural caves have been vastly extended. The search for more riches continues, with ever-developing technologies requiring more and more highly-prized resource materials.
As the planet’s crust becomes more hollow, so its surface becomes more unstable, presenting a risk to the lives and infrastructure of those who live above or nearby.
Unmanned resource-locators track down and auto-mine specified exotic materials.
Naturally, there are heavy defences installed at all access-points to the cave networks. Nothing gets in or out without the utmost scrutiny.
Big business takes no prisoners. Stray too close, and the monopolies will react!
Negotiation is NOT on the cards.