When the breathing apparatus wearer is unable to escape from the risk area, they should:
- Contact the BA entry control point by radio (if possible)
- Operate the distress signal unit
- Relax as much as possible in the circumstances by assuming a reclined or seated posture
- Breathe calmly and gently to minimise air usage.
Any supplementary air supply should not be operated and the cylinder valve should not be adjusted other than to check that it is fully open.
Once the safety margin has been reached, the low pressure warning device or whistle will activate. In the case of an air-operated whistle device, the air consumed is minimal; electronic low pressure warning devices do not use any air.