Drone crash in water

I crashed my Iflight Chimera 7 FPV drone into the water :-(. I suddenly lost control of the drone: I could no longer steer it with my TBS Tango 2 controller. As you can see and hear in the video, when it lost control, the direction of the drone and sound of the motors changed, this was at 2:02. It is unknown to me what caused this. Most of the drone parts were defect.