Billings firefighters detail recent rescue at Western Sugar silo OSHA officials confirm 'open investigation' Billings firefighters detail sugar factory rescue By: Andrea Lutz and last updated 2021-06-09 10:47:49-04 BILLINGS -- An investigation is underway into what led to a worker being buried to his chest in late May at the Billings Western Sugar Cooperative, according to a spokesperson with the Occupational Safety and Health Administration. However, what caused the incident is still unknown. âThis is an open case and because of it we cannot provide further information or details at this moment,â said spokesperson Josa Carnevali in an email late last week.