Leader below ground duties require safety supervision, route marking, lifeline control, and strict limits on breathing apparatus use. Duties of a leader below ground require the leader to avoid manual work, direct and safeguard the team, inspect roofs and supports, keep the team together, mark routes at junctions, maintain a lifeline or fencing in obscure atmosphere, and manage rescue apparatus with time and oxygen-pressure checks. The leader must travel at the pace of the slowest member, return immediately if any member is in distress, and ensure limits on the duration of work by a person using breathing apparatus.