Wi-Fi signals operate using 2.4GHz electromagnetic waves to transmit data. Water, being a medium with a high dielectric constant, can absorb and scatter these electromagnetic waves significantly. When the robot is submerged in water, the water acts as a barrier that severely attenuates the Wi-Fi signal, making it difficult for the robot to maintain a stable connection to the network. The loss or weakening of the Wi-Fi signal in water can cause the robot to lose its connection to the network and go offline.