It’s a steel storm shelter which opens into ... Check out the finished version on the right after the shelter has been slid into place and bolted to the concrete slab. The Reddit discussion ...

Another option is a prebuilt one-piece steel or modular cast concrete unit ... Safe rooms or storm shelters can be built any ...

It's run by a woman known only as Kala, and the account's posts date back to October 2022, when she announced she would be building a "storm shelter ... pouring concrete, and installing support ...