zfs discuss - Apr 2010 - zpool created over existing one, recovery

I had a zpool of 3 X 1TB disks in raidz1 configuration. After installing a new
version of freenas (the OS is not important) I accidentally created a new zpool
over the existing one (it took just few seconds). Now I can see the empty raidz1
(only few KB occupied). I didn''t write any file to disk so I believe
old data to be still there.
I found a thread, "Need Help Invalidating Uberblock ", where an user
manually messed the uberblocks to access previous directory tree.
Is there a way to recover my previous zpool? It was healthy before my mistake.
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