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Life often comes with a damaged or stolen manhole cover and the danger of falling down the well, many people will put something on it as a cover, but still people can fall in and have accidents. The manhole cover has been designed to provide a safety warning, when the cover is taken out, it triggers a sensor and three shrapnel will pop up to surround the cover, the shrapnel bounces up to a height that can be observed by pedestrians and vehicles. The only way to retract the shrapnel is to put the manhole cover in. The safety warning manhole cover takes up no space and also acts as a warning against accidents when the cover is not in place.