The First Step
Once he had purchased the container, the first step was to seal the entire thing shut. Rather than using giant double doors, he sealed this entry closed to ensure that nothing could go in or out, especially any leaks. He then installed an inward swing door on the opposite side.
Avoiding Mistakes
Wayne’s biggest mistake would have been to dig a hole that wasn’t big enough to fit his container. That’s why he made sure to dig a hole that’s no less than two feet deeper than the container’s height, as well as two feet of space open on each side.