In cave diving having a continuous guideline out to the surface is a must. This is one of our golden rules from analysis of past accidents. The guideline helps to orient divers thought cave tunnels, like hiking trails through forest. Losing the line, especially in zero visibility, is a serious emergency which is why it is practiced during cave diver training. Ask me anything about cave diving safety 👇 #cenotes #cavediving #tulum #sidemount #cenote #mexico #cavedivertraining #diver #techdiving #