To　date　it　remains　challenging　to　clarify　the　corrosion　mechanism　of　coaxial　nanocables　in　an　oxidative　moisture　environment,　which　sets　an　immediate　bottleneck　for　their　engineering　application.　Herein,　we　report　a　series　of　in　situ　structure　evolutions　of　Ag　and　Ag@C　coaxial　nanocables　in　a　liquid　environmental　transmission　electron　microscope,　followed　with　mechanistic　unraveling　of　their　oxidative　corrosion.　The　bubbles　generated　by　Ag　nanocable　oxidation　inversely　triggered　rapid　dissolution　of　the　nanocables　in　radiolytic　water.　For　the　complicated　dissolution　of　Ag@C　nanocables,　the　oxidative　species　interact　with　carbon　defects　to　thicken　the　carbon　shell;　as　a　consequence　of　holes　drilling-on　and　exposure　to　the　oxidative　water,　the　inner　Ag　nanocables　were　triggered　for　its　dissolution.　The　derived　oxidation　mechanism　of　nanocables　provides　us　new　insight　into　accurately　controlling　antioxidative　chemistry.