The "Treaty banning nuclear weapon tests in the atmosphere, in outer space and under water" is often abbreviated as "the Partial Test Ban Treaty (PTBT)", "Limited Test Ban Treaty (LTBT)", or "Nuclear Test Ban Treaty (NTBT)". Nuclear weapon tests in the atmosphere (like the Starfish Prime high-altitude nuclear test on July 9, 1962), in outer space and under water (like the Operation Crossroads) were banned on environmental grounds. Any blasts that caused radioactive debris to leave territorial limits of the state exploded it were also outlawed. The UK, USA and USSR all singed up to it as the fear of radiation sickness was common to all parties that had nuclear weapons to make, test and store.