Video answer: Dropping a gopro underwater and fishing around it!
Top best answers to the question «How long can you keep a gopro underwater»
Standard with every GoPro camera, the waterproof housing can withstand depths of up to 131 feet (40 meters). You can leave the housing on the camera when you're using it for non-water-based fun.
Video answer: Gopro hero8 (under)water photography tips & tricks