When Wayne Martin started digging a giant hole in his backyard, his neighbors thought he’d lost his mind. Little did they know that what he actually had planned was one of the most ambitious backyard construction projects of all time.

But when he was finished, all of their curiosity would quickly be replaced by burning jealousy.

First, Wayne purchased a 20-foot shipping container he found online.

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He sealed the double doors at the end and installed a swinging door on the opposite side.

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He made sure to dig a hole at least two feet deeper than the height of the container and put a six-inch layer of peat gravel at the bottom.

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He hired a septic tank company to lift and place the container in the hole.

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He left about two feet of space on the sides, and a few feet in front of the swinging door.

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He also made a hole for the sump pump that would go in.

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Next, he put in a set of concrete steps, making sure the top stair was level with the top of the container.

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He then installed two I-beams, keeping them level with the stairs and the container top.

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More framework was added to support the roof.

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Across the framework, he laid sheets of heavy corrugated metal.

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He left an opening over the stairs and surrounded it with rebar.

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Cinderblocks were laid and filled in with more concrete.

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Two 12-inch air vents were installed at the front and back, along with some PVC piping for utilities.

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Finally, it was time to start pouring concrete!

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A six-inch layer was added over the rebar and corrugated metal roofing.

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More blocks were then added to the entrance.

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And the temporary supports could be removed once the concrete dried.

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He used high-quality soil to fill in the space around the entrance so that things could be planted there.

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What better to fill your apocalyptic shelter with than wine?!

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Here’s what it looks like from the back looking out.

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Watch the whole process step-by-step!

Of all the backyard DIY projects we’ve seen, this one really takes the cake. Imagine having something this cool in your backyard!

Share this awesome piece of ingenuity with your friends below!