26. If any shell fails to fire, the person attempting to fire the shell—
(a)shall not himself approach nor allow any other person to approach the shell during the interval of ten minutes after such attempt;
(b)before approaching or allowing any other person to approach the shell shall disconnect the removable handle or key and the cable from the shot firing apparatus;
(c)shall then examine the cable and connections for any defect;
(d)if he leaves the working place while the shell remains there shall cause notice of the miss-fire to be given to the deputy in charge of the district and ensure that sufficient fences and danger notices are erected to notify the miss-fire to any person approaching the place.
27. If any shell fails to fire, no person shall attempt to remove it from its hole until any external firing wire has been disconnected from it.