What is the suggested ascent speed to the surface during an emergency evacuation of chamber occupants?

The suggested ascent speed of 10 feet per minute during an emergency evacuation of chamber occupants strikes a crucial balance between safety and efficiency. This rate is recommended to minimize the risk of decompression sickness, also known as "the bends," which can occur if divers ascend too rapidly from deeper depths.

When ascending, the body must adjust to decreasing pressure, allowing nitrogen, which has been absorbed while under pressure, to safely off-gas. A slower ascent rate of 10 feet per minute allows adequate time for this off-gassing to occur without overwhelming the body's capacity to safely release nitrogen, thus reducing the risk of potentially life-threatening complications associated with rapid ascents.

This also takes into account the potential anxiety and disorientation that occupants might experience during an emergency. The gradual ascent provides a more controlled and manageable situation for individuals who may already be in distress, facilitating safety and recovery during the critical moments of evacuation.