Deefstes
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Apart from the risk of air embolisms or pneumothorax there is also the risk of decompression sickness, although not neccessarily applicabe to a student.
Either way, I would think the real reason why you shouldn't bolt for the surface when something goes wrong is because you need to get the skills to sort out whatever goes wrong exactly where you are. Training for a diving cert is not about getting the skills to prevent things from going wrong but getting the skills to be able to deal with it when it does. You don't get those skills by bolting for sunshine and seagulls when you're slightly uncomfortable. One day you may not be able to simply bolt, what then?
Either way, I would think the real reason why you shouldn't bolt for the surface when something goes wrong is because you need to get the skills to sort out whatever goes wrong exactly where you are. Training for a diving cert is not about getting the skills to prevent things from going wrong but getting the skills to be able to deal with it when it does. You don't get those skills by bolting for sunshine and seagulls when you're slightly uncomfortable. One day you may not be able to simply bolt, what then?