An interesting short overview of some important tools used for overhead penetrations (caves, mines, wrecks):
Tag: cave diving
Cave navigation…
Wreck diving & cave diving are sharing some similarities in safety procedures, protocols and operations. Some of them are related to using of directional & non-directional markers, jumps, lines, spools…

The following material “Zen and the Art of Mexican Cave Navigation“published in GUE‘s blog InDEPTH is a very good reference to analyze, learn and apply in any overhead environment.
Dive Safe!