The Chasing M2 S underwater robot (ROV) is an underwater recording device consisting of a robot with 8 propellers, a camera, two lights and a battery. The underwater unit is connected to the controller via a 200 m-long cable that is wound manually on a winch. The controller is connected to a mobile phone or tablet on which the video from the 4K resolution camera is projected. The declared duration of the battery is a maximum of 4 hours, depending on the operating conditions. LED lamps have a brightness of 2000 lm. The motion sensor contains an axis gyroscope, accelerometer and compass, and all measured data is displayed on the screen.