While visiting Carlsbad Caverns one of the speelunkers advised about the rules of three for cave exploration. One was to always bring three sources of light. He expanded to say that there had been several times when he was on the last of the three when he finally made his way out. Yikes!

Not nearly so calamitous as deep in the bowels of the earth but an extra light could indeed make or break the day. Like Capt. Call said in Lonesome Dove "better to have it and not need it than to need it and not have it".

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RRhyne56
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