Upon initial inspection and evaluation of the confined space, if it is determined that a person could be injured in such a way that he/she would not be able to self-rescue (e.g., climb a ladder), then a retrieval system is necessary. If entering a confined space where the potential for a fall could occur (i.e., a person could slip or lose control climbing a ladder), then fall protection must be included in the confined space entry system. A self-retracting lifeline with a winch retrieval system provides rescue retrieval for a worker entering a confined space should he/she become incapacitated. It is the responsibility of the employer to evaluate EACH space separately, and develop entry and rescue procedures for EACH individual space, according to 29 CFR 1910.146(d)(3) and 29 CFR 1910.146(d)(4). Generally speaking, according to the Preamble to the Confined Space Standard, at a depth of 5 ft. or greater, some form of mechanical means is needed to extract the worker from a vertical confined space.