2. Cylinders are used to store oxygen under high pressure
3. Contents gauge indicates the amount of oxygen in the cylinders
4. Cylinders are used for transporting oxygen with the diver
5. Depth gauge was designed to indicate the depth of the water
6. Buoyancy jacket is for supporting the diver in the water
7. Diving mask was designed to see clearly under water
8. Contents gauge acts as a kind of alarm clock for the diver
9. Demand valve supplies oxygen to the diver when he or she needs it
10. Buoyancy jacket acts as a very strong lifejacket
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