How to use inflatable lift bags?

What is inflatable lift bags? Inflatable lift bags is one kind of all-purpose buoyancy units. All underwater lift bags and marine salvage bags can be called inflatable lift bags. There are many types of inflatable lift bags. Such as parachute type, totally enclosed type, pillow type, elongated pontoon type, dual boom, and others. These lift bags have different application. Parachute type lift bags can be used for the underwater [...]