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The lifeboats are very important once there is a shipwreck. But there is usually numbered lifeboats on the ship because of their large size. The extendable is a rapid air-lifeboat that can be charged with air automatically when it is drawn in both directions. Both sides of the lifeboat are in extendable structure, which can be charged through the air holes. When the lifeboat is needed, two users may hold the handles at the both ends and draw with strength. And when it is not in demand, it can be compressed to decrease the size. So, there can be more lifeboats prepared on the ship to deal with the accident.