One of the things that one learns about on the PADI Open Water Course is nitrogen loading. There are various charts that one needs to learn to use in order to ascertain how long one can remain at certain depths before being required to return to the surface. This is to avoid the bends. It is also inadvisable to fly within 18 hours of multiple dives
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"Accordingly, on our last full day in Egypt we all went on an excursion to the coloured canyons. "
as
"Accordingly, on our last full day in Egypt we all went on an excursion to the coloured crayons. "
It completely changed my perception of the holiday
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