I highly recomend it. They built a building around it and they did have veterans that actualy helped capture it working there as volunteers. They still have other veterans working there too giving info about the capture. A very very awesome experience. Deffinately pay and go on the tour inside the sub tooI last went there after they updated the model train exhibit, because I donated money for that.
But, I haven't seen the new sub exhibit. For some reason though, I really want to.