The sea is the variety of conditions that you can never know everything. With the device that you are wearing and with the training that you have provided, you can have fun safely. If exceeds the capabilities of the device and/or the training, you can push yourself into the position of stress and may be in danger. Recreational diving is a fun activity. You make sure you're safe, relaxing, and your experience was enough for you to be ready to deal with what might happen in the environment that you are diving.
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