GANOVEX VII team practices crevasse rescue at
Mount Cook National Park, New Zealand.
Photo © Bruce Luyendyk
[Scene. Bruce and Christine are part of a German Antarctic expedition. Before departure for the Antarctic the GANOVEX expedition trained for snow and ice safety at Mount Cook National Park in New Zealand.]
1 A Z-Drag or Z-Pulley is an arrangement of lines and pulleys commonly used in rescue situations. The basic arrangement provides a theoretical mechanical advantage of three. The name comes from the fact that the arrangement of lines is roughly Z shaped. Besides the mechanical advantage to pulling, it also uses only part of the total length of the rope for the block and tackle arrangement. (Wikipedia)