The thread did not turn out the way we hoped. We hoped that others input would give us great insight on how to have a great wine cellar and that they did. There is a wealth of great information here on the forum. We are all fortunate to have so many folks from different walks of life who are willing to help out others with their personal experience.
Sadly we hope others will learn from our disastrous situation and know the correct way to build/dig a wine cellar.
I found this thread looking for a temporary solution of my own. I didn't see anyone mentioning growing grass on that bare dirt as a solution? I don't know if watering the dirt will harm your cellar, but grass will bring down the temperature of the soil and absorb sunlight. I have no real world experience with this stuff, but I do know on a hot day dirt is warmer than grass. Grass will grow in faster than a tree, and if you're able to get sod it's instant.