; Summation of all or nearly all survey lines around Second Choke ; includes Crawl, Dig A, Albert Hall, Wet Way, Cellar, Dig B, Roof ; Chambers. ; 2CM is 2nd Choke Mkr *begin choke2 *export digA.1 *include digA *include roofchambers *include digB *include wetway *include cellar *include wetblackrift *include albert1 *include albert2 *include albert3 *equate digA.1 roofchambers.1 ; 2CM *equate digA.1 digB.7 ; 2CM *equate digA.1 wetway.1 ; 2CM *equate wetway.9 cellar.4 ; CellM *equate wetway.9 wetblackrift.9 ; CellM *equate digA.22 albert1.7 *equate albert1.1 albert2.1 ; AHM *equate albert1.1 albert3.5 ; AHM *end choke2