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I have finished the construction of the sub,( mabie someone can tell me, are we ever finished building these things??) and all I have to do, is hang some weights on it..and it's ready to go..( I still think I am finished, weights dont count do they??) it holds a vacuum, and a slight pressure.. I can survive in it for over 1 hr, with no headaches or anything..(1 hr and 5 min, 34 sec to be exact) , I have no air leaks, and therefore figure it might not leak too much water.. and It weighs 1780 lbs..I have tested the pressure compensation system again, and again, and again (only on land though) and it works as I planned, I found out the paint chipps off when you drop it off of a trailor..(nuts), and I have found out that October is sometimes cold in Alberta, and that water gets a hard surface on it when it gets cold..It was suggested that we drop it from higher, and that might get it into the water, through the hard surface, but I think I will see if the ice melts first.. We are supposed to be getting a warm spell, and if the ice dissapears, Ill launch.. otherwise, it will be next spring now.. Ill post some pics of the finished product soon..