Lowering the oxygen level to the minimum level leads to the fact that the person is quiet, the skin turns blue, and the brain receives a signal that it is necessary to wake up.
Encishisiwe amazinga oxygen ukuze eliphansi kubangela umuntu uthulisa phansi, isikhumba ujike okwesibhakabhaka, nobuchopho ithola isignali ukuthi kudingeka baphaphame.