platforms

in the event of an emergency, the need to ensure that all personnel are evacuated can not be overemphasized as a value can not be placed on a single human life, as such safety procedures requires that evacuation must be in place, the Chevron rig explosion aboard KS ENdeavor is a typical example  out of 154 personnel aboard the vessel 152 were safely evacuated [1]. can this be termed as successful?, could the loss of lives have been prevented? when is the ideal moment to abadon a rig in the event of an incident occuring?