First off, thank you Julie for moving everything to one thread for me. It is much appreciated.
To answer Jim's question we have very high humidity here in the summer. Typically we have 3 to 4 months of 90 degree weather with the high humidity.
So we found a place about 20 miles from here that makes tornado shelters. We drove up there and saw the shelter and spent 2 hours talking to the owner. We actually went down inside of the unit.
Details are it is a 6' x 8' and 8 person tornado shelter that is FEMA approved. We would think it would be hard pressed to get 8 people in it at one time but he told us average time spent in a tornado shelter is 17 minutes. I only mention this because it would take about that time to add or remove or add wine.
It is made of 6000 psi concrete reinforced with #3 cage rebar that has 3" concrete walls and 4-1/2" cement on the top and bottom. The door is an 80 pound steel door.
Price delivered and installed is $4500.00 I suppose most of the price is because of the FEMA endorsement.
It is typically set in the ground at 3' depth with about 2 feet of dirt over the top except where the door is set in the shelter to allow entrance. The door is set in at a slanted angle so that debris from a tornado would not be straight on and would be veered off. The door is air tight. The door is not in the photo shown but it can be seen in the attached photos where it would go.
There are 2 vents on the top (the photo shown here was an older model that only had one vent) to allow moisture to escape and air in for tornado protection. The unit can be modified to remove one or both of vents.
One other point it comes in 2 pieces and you can see the "seams" in the unit. The reason for this is because of the weight, it has to be delivered on 2 trucks.
The seams are finished off with epoxy once the unit is in place in the ground.
We are still waiting to hear from the contractor on his price and how he thinks it will be built.