[en] The steady state super-conducting tokamak-SST1 comprises of two vacuum chambers (a) The vacuum vessel is a UHV chamber in which plasma will be formed and confined (b) The cryostat is a high vacuum chamber which houses the liquid Helium cooled superconducting coils. Leak detection plays a very important role in the achievement of desired vacuum level in any vacuum chamber. Leak detection of the cryostat chamber and vessel modules of SST - 1 involves various types of unconventional methods. It includes masking with thick polythene with Q- compound to cover polythene's border, masking with aluminium foil with adhesive tape to cover its border, formation of D-shaped gasket using industrial adhesive solution, acetone spray method for high order leak, etc. Pressure test with Nitrogen and Helium gas carried out to locate coarse leaks. This paper discusses description of the techniques for helium leak testing and its result. (author)