Oceans

Which underwater machine helps humans travel around beneath the surface of the ocean?

More Questions from Oceans
What is the most poisonous fish in the world?
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The longest river in the world is located on what continent?
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The Titanic was how many feet from keel to bridge?
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Brine pools in the ocean have an unusally large concentration of what?
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What is the periodic rise and fall in the ocean's water level called?
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What is a tropical cyclone formed in the Pacific Ocean called?
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How many chambers do the hearts of sperm whales have?
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Iceland is located in what ocean?
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