Meet the PowerRay Underwater Robot: a versatile vehicle developed for freshwater, saltwater, and ice fishing. It uses sonar technology to detect fish and send images of underwater landscape and temperature data to you via WiFi. The robot can dive as deep as 30 meters and detect fish up to 40 meters below it.
The robot has a WiFi system that enables transmission of images and data over 80 meters. You will be able to view photos or video captured by the 4K UHD camera on your iOS or Android device. FPV goggles are also supported.[where to find more info]