11. The utility must provide educational information to its underground workers on proper trenching and tunneling. 12. Desperate to avoid recapture, he contacted a French underground worker whose sister was a nun. 13. At its peak in 1953, the mine employed 1, 448 underground workers and 393 surface workers. 14. Also together, the groups worked to support for underground workers 'and anarchist movements in the Soviet Union. 15. On Friday 15 June, an underground worker from Kellingley Colliery named Joe Green was killed whilst picketing. 16. Underground workers already are paid a minimum of 2000 rand ( US $ 268 ) a month.17. Those arrested are taken by ship, which is piloted by one of the underground workers . .. 18. On 4 March 1945, the colliery suffered an accident that caused the death of five underground workers . 19. He said 30-40 underground workers had heard " rumblings " 15 minutes before the accident and got out. 20. There were no fatalities, though one London Underground worker suffered cuts to his eye caused by glass debris.