32.1.5.
All workers should be withdrawn from underground
workings if:
the ventilation fails; or
other imminent danger threatens.
32.1.6.
Parts of underground workings found to be dangerous
should be fenced off.
32.1.7. A telephone system should be maintained from the
vicinity of the face of underground workings to the surface with
stations at intermediate workplaces.
32.1.8.
In underground workings that are Wet, the workers
should be provided with waterproof clothing and boots.
32.1.9,
In tunnels and other underground workings where
an explosive mixture of gas such as methane and air may form,
operations should be carried on in accordance with national
or other official regulations applying to gassy mines.
32.1.10.
In these cases referred to in paragraph 32.1.9, in
particular:
(a) all electrical equipment and conductors should be flame-
proof or intrinsically safe