In a message dated 2/17/00 1:35:54 AM Eastern Standard Time, vulcania@interpac.net writes: << However, other aspects (like the hydrobatic ballast system) are in some ways better than I've seen on other subs. >> Hi Captain Nemo! That was a great letter, but the above reference piqued my interest. I'm not familiar with a "hydrobatic" ballast system. Can you describe this in more detail? Thanks! Stan