To safely and repeatedly launch a water rocket to a distant destination, to finally finish spreading a rescue rope an to quickly perform life saving and goods transportation at the time of saving a life and performing a rescue at the time of disasters such as a typhoon and a flood, etc.

A reel 2 (string winding device) is attached to the rear part of a fitting device 1, a waterproof shield 3 is attached to the tip of the firing device 1 and a guiding rail 8 is attached to the front. Further, the water rocket 4 is connected to the tip and the water rocket 4 is launched by the firing device 1. After it reaches the destination, to an auxiliary rope 6 wound to an attached drum, a main rope 7 similarly wound to the drum is transferred and the two points of a rescue person and the destination are connected.