The lenght would still be limited. 

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As a scuba diver, you would not want to use one of these. It is a very questionable idea, especially when used by untrained.
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Very cool
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A big long snorkel, big deal. SC in Scuba stands for self contained...no cables. No thanks
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Do you think it is impossible to sink? It's a very bad design that may lead to death..
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it's dangerous because of bad air
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This is awesome!
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