I was raking thru the dirt under an 1840's building this past weekend a came across the cistern. We removed the stone cover and the water was crystal clear. We could not see the bottom, but it probed out at the depth of about 10'. This building was the local potter in 1840, and was in business for 20 plus years. I was thinking about doning the scuba gear and taking the plunge, but before I go thru this bone chilling adventure, what are the chances of any treasures being preserved in this time capsule? Would it be worth it? This building is in the process of being demolished so I will never get this chancs again, because they will fill it in. What do you experienced cistern diggers think? Thanks