Sunil, we haven't completed the job yet, but I purchased a hardened steel 1" diameter hole saw after I was unable to purchase the burr that had been recommended in the forum. I hope that we can cut between the lugs on the tops of the tires. The tires are fantastically heavy, but I know the power of air to lift things underwater. I hope it works.

I'm still mulling over the tree options. I love thinking about this stuff. I have dreamed about doing this since I was in elementary school. Never thought I would get it done. I always enjoyed getting ready to fish almost as much as the fishing. Same with this process. I have two young sons, and I guess someday they will be dividing this land. I hope to have two great ponds for them to divide. This deep pond might last for hundreds of years. It is almost impossible to build anything else that might last as long. After my family, this has given me more pleasure than anything in my life. If I never catch a fish, it was already worth the expense.