Battery died. Tried to turn around and come back. It started dropping. I gave it full throttle but it continued down into the lake. Amazing part... everything still worked... and still works. Go Pro Hero 3+ Black was not in a waterproof case. I immediately removed drone & Go-Pro Batteries. Go Pro btty backpack red ledwas on. Dried it in car's defroster. Light went out & I later recharged. FPV & Gimbal ok too.