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Today, with the exploitation and transportation of seabed oil resources, marine oil spills occur frequently, and the huge oil spill area seriously affects the natural environment.The Ocean Guard provides a new way to collect surface oil.After the oil spill accident, the aircraft carrying Ocean Guard would deliver them to the oil spill area. The Ocean Guard starts automatically after launching, which would cover a certain area of oil spill. When the Ocean Guard slowly shrinks, water in the limited region is discharged, leaving only crude oil, because oil density is less than water. It can be recycled by salvage ship after its bottom is closed.