You should be able to answer these simple open water questions without the answers, if you cannot then re-read the open water manual, you should also be able to explain why the wrong answers are not correct to someone that thinks that they are correct! Eustachian tube leads to the middle ear (from the throat).Shallow Water Blackout caused by Hypocapnia due to a falling oxygen partial pressure. Divers are most affected by CONDUCTION.For your information: Most countries apart from the US use Bar as a measurement of pressure for tanks.
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