Now that you've secured the perfect location and created a basic shelter design, it's time to dig for survival.

Using your trusty pickaxe, carefully excavate a tunnel system that'll allow you to move undetected and unseen. Don't forget to include a few hidden compartments for emergency storage and a backup power source.

As you dig, keep in mind that the perfect bunker has a few key features: a hidden entrance, a secure airlock, and a self-sustaining ecosystem. Oh, and a few comfy chairs for when you want to lounge in style.

Next stop: Step 4: Ventilation and Climate Control

Or, if you'd rather get a bit more... extreme: Step 3 B: Tunnel Terror