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10 questions about the basics and fun facts of scuba diving
Bubble maker 0–4 · Fun diver 5–8 · Dive master 9–10
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Pure oxygen quickly becomes toxic to humans underwater due to the high pressure. Therefore, divers simply breathe filtered and compressed gas that largely consists of nitrogen, just like the air we breathe on land.
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A scuba regulator ensures you can breathe comfortably underwater by automatically adjusting the air pressure to the water pressure pressing on your chest. Did you know that the sound of your own breathing underwater sounds like a storm of bubbles?
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A drysuit seals hermetically so that no water at all reaches your skin. This allows you to dive even in freezing polar water with warm clothes underneath, while the air in the suit provides extra buoyancy.
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This special vest, also known as a BCD, can be filled with air to float or emptied to sink. Divers use this to effortlessly glide weightlessly through the water without needing to exert force.
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Under water you cannot talk, so divers use hand gestures. The thumbs up actually means you want to go up immediately and stop the dive, while the circle with thumb and index finger indicates that everything is completely fine.
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Due to the high pressure underwater, extra nitrogen dissolves in your blood. If you ascend too fast, that gas forms just like bubbles in a popped bottle of soda, which can be very dangerous for your health.
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Due to increasing water pressure, you quickly feel pain in your ears and nose. With a flexible nose pocket in your diving mask, you can exhale through your nose and pinch it to clear your ears so that the air pressure in your head is equalized.
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Metal conducts sound underwater extremely well. By gently tapping a metal object against the oxygen tank, a clear sound is created that other divers in the wide surrounding area can hear immediately.
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Water filters sunlight very selectively. Red light has the longest wavelength and is completely absorbed at shallow depths, making it the first color to 'disappear'.
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The bag of chips gets smaller and smaller because the increasing water pressure compresses the air inside the bag. The deeper you dive, the more the bag is crushed!
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