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When the manhole cover was lost for flood or something else, to warn passer-bys, Watcher would float up and make itself shine with fluorescence. And the nylon wire netting would change into a vault by the buoyancy which the He provides. Another case, when it's under maintaince, the net also protect the maintenance worker's personal
XiangTan University
Xiangtan of Hunan, China
Meijie Tang,
XiangTan University
Kefan Deng,
XiangTan University
Yingying Fan,
XiangTan University
Jianping Luo,
XiangTan University
