Hi. During Feb I was able to see 3 sections of this enormous weapon at an artillery museum here. Thought you might find it interesting. It is huge and made of stainless steel. "The project, if it had been successful, would have created a gun capable of firing a 600 kg (1320 lbs) projectile 1000 km, or, even more threatening, a rocket assisted projectile into orbit. From orbit it is possible to hit a target anywhere on the planet, and if it were equipped with a nuclear warhead, one can imagine the consequences. Another purpose for the gun would have been disabling spy satellites. Project Babylon was not successful, however, because Gerald Bull was assassinated outside his apartment in Brussels, Belgium in 1990. The assassin was never found, but the Israeli intelligence agency, Mossad (Hebrew for "institution"), is suspected to be responsible."