Was the DHS kidding about using the duct tape and plastic? Not only were they serious, I think its a good idea to know how, just in case you cant BO and have to

Prepare beforehand and practice shelter in place procedures with your family. You may not have time in the event of a real emergency to learn by trial and error.

Nationwide network of co-ownership underground catastrophe shelters.

Whether you live in a house or an apartment, you can still create a safe room to which vulnerable family members can retreat in an emergency.