Superconductors used in a large superconducting magnet system are generally designed to be cryostable. There exists a strong possibility that cryostable conductor will burn out in a helium gas environment should a normal zone be generated from any point of the coil above the liquid helium level. An experiment is set up to investigate the heating of a cryostable conductor in a helium gas environment. Results will be presented and the ultimate safety of a cryostable conductor will be discussed.