The main purpouse of the lab is to uncover the hidden secrets behind the alien thret, as well as to help develope new equipment and other devices to imporve the human races chance of survial. The lab is S.N.A.I.L.'s primarry tool in the future of the Earth.
The main lab of S.N.A.I.L. is acctually hidden deep within the underground complex in New Hope, Minnasoda. Most of the none top secret research is done in an FBI lab, which is the main cover for S.N.A.I.L., in New Hope.