Escape and Rescue from Mines Regulations (Northern Ireland) 1999 No. 173

Regulation 27

Schedule Number of Repetitions of the Audible Signal

Purposes	Number of signals
‘Distress’ or ‘Help wanted’	ONE signal
(If no answer is given to a call, ‘Distress’ is to be understood)
Halt	TWO signals
Retire	THREE signals
Advance	FOUR signals
To call attention	FIVE signals