It's pretty tricky to talk underwater, and so divers use a series of hand signals to communicate with one another. Try to practise these with a friend.
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The thumbs up sign means 'Ascend' or 'Go up' rather than good.
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This dive sign means 'Descend' or 'Go down'.
This dive sign is both a question 'Are you ok?' and an answer 'I am ok'.
This is the dive sign to ask 'Which direction?'. You might reply to this by pointing in the direction you want to go in.
This is the dive sign for 'Turn around'. Use dive signs to navigate around a virtual dive in the classroom.
This is the dive sign for 'Time to Head Back'. It's the same as the 'Time Out' signal that people use in other contexts. It's time to head back when your air is low or when you have finished your dive objective.
This is the dive sign for 'Stop'.
This dive sign means that 'Something is wrong'. Divers normally use this sign and then point to the thing that is wrong, such as a painful ear. If you can't equalise the pressure in your ears and nose when descending, the pressure can build up and become quite painful.
This is the dive sign for 'Take it easy', 'Slow down' or 'Relax'. When people first start diving they may begin to panic a little and this allows the dive master to calm them down. Use dive signs to navigate around a virtual dive in the classroom.
This is the dive sign for a lionfish. Divers use a variety of different signs for the different animals on the reef. These animal dive signs are not as official as the safety and navigation dive signs.
This is the dive sign for a turtle. You need to move your thumbs in a circular motion to mimic a turtle swimming through the ocean.