| 摘要 |
A lift device may comprise a housing containing a lift bag and a tank containing a working gas. The lifting device may be attached between a lift line descending from the surface of a body of water and a submerged object to be raised. A gas release mechanism that forms a part of the lifting device may cause the tank to emit a gas in response to tension on the lift line to fill the lift bag and float the object to the surface.
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