History
In 1977, Sheck Exley published Basic Cave Diving: A Blueprint for Survival which pointed out that the lack of a continuous guideline was one of five contributing factors in cave diving accidents.
Read more about this topic: Distance Line
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“He wrote in prison, not a History of the World, like Raleigh, but an American book which I think will live longer than that. I do not know of such words, uttered under such circumstances, and so copiously withal, in Roman or English or any history.”
—Henry David Thoreau (1817–1862)
“There is a constant in the average American imagination and taste, for which the past must be preserved and celebrated in full-scale authentic copy; a philosophy of immortality as duplication. It dominates the relation with the self, with the past, not infrequently with the present, always with History and, even, with the European tradition.”
—Umberto Eco (b. 1932)
“A man will not need to study history to find out what is best for his own culture.”
—Henry David Thoreau (1817–1862)