You can get lost in caves and run out of air.
You can get stuck in a small gap and run out of air.
You can miscalculate how long it will take to resurface (including going slow enough to avoid the bends, which you didn’t have to do on the way down) and run out of air.
You can get your air hoses or valves damaged on sharp surrounding rocks and run out of air.
You can get sucked into somewhere you didn’t want to go by a current.
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