Humans like to do things efficiently, or as some call it, cutting corners. The problem is that when the configuration changes and the diver cannot recall the 'situation' and it bites, it sometimes ends up with a dead diver.
Complacency is a term often used as one of the key factors when it comes to diving fatality reports. The problem is that complacency is only really apparent after the event because we have had something occur that shows us how far we are from the ideal. The same mental developmental processes which allow us to operate efficiently are also the same processes which can lead to an accident. Complacency can be summed up as the difference between the perceived model of the world and the reality of the situation. To save time, humans create models of expectation of what is happening around them so that we don't have to process vast amounts of information. If nothing changes, we run that mental model making assumptions about what will happen in X...
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