From previous ..

There were hundreds of prisoners  in and around the football field and  josef waiting for his associates  roger and  nikolson  was sure their absence will not be missed, nobody  was going to count how many inmates were  not there, meantime the two if them had succeeded in  reaching the drainage old pipe  feating the deadly gases they skipped entering the pipe next day but when the following day they saw the dry area it was clear to them the old system was still functioning very well