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Yes, if you dive and release the Safety Buoy under water, the buoy pulls you up. It is connected to the safety line with the belt. The same amount of gas always flows into the buoy, which means that at sea level and room temperature it is well filled. When you dive, the ambient pressure increases by one bar for every 10 m of water depth, and at the same time the buoyancy force is reduced in depth, as the gas is compressed.

This results in the following buoyancy depending on the depth:
0m depth = 1 bar = full buoyancy = 75N = 7.5kg
10m depth = 2 bar = half buoyancy = 37.5N = 3.75 kg
20m depth = 3 bar = third buoyancy = 25N = 2.5 kg
30m depth = 4 bar = quarter buoyancy = 18.75N = 1.87 kg
40m depth = 5 bar = fifth buoyancy = 15 N = 1.5 kg

As soon as you get higher again, the resulting buoyancy of the buoy increases until it is fully available again at 0m/sea level.

Like a lifeguard buoy, the Safety Buoy can also be pulled inflated by the belt behind you. The resistance can not be felt in the water and you can also dive through waves very well.

Yes, the Safety Buoy may be taken on a plane. Depending on the version, original RESTUBE CO2 cartridges contain 16g or 10.9g CO2 and are under pressure. They are considered a hazardous material in air transport. However, according to the IATA and LBA, passengers may take up to two CO2 cartridges with them in combination with the Safety Buoy. Register RESTUBE CO2 cartridges promptly before your trip begins by phone with the airline and carry a written confirmation from the airline (email) and the green flyer during your trip. All documents and other information are available here: https://restube.com/pages/flying-with-restube

No, it is not a substitute. The RESTUBE safety system is the most versatile system for more safety in the water. Anyone who needs an approved swimming aid in vest form, for example for stand-up paddling in Switzerland, can use the PFD. In any case, always follow the local rules and regulations. Safety concerns us all!