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In a sunken cabin, the part of the cabin where there is still air due to pressure is called an air pocket.
When a large ship sinks, people can get trapped in air pockets .Limited oxygen makes rescue difficult .The main users of this product are people trapped in air pocket. Users can easily use this product without knowing it .This product can provide oxygen and lighting to the user, extend the user's survival time in the air pocket .It can also provide evidence to rescue workers that someone is trapped.
Xi‘an University of Technology