I suspect Fuji would strongly recommend against total immersion of the X-T1. To my knowledge they make no claims that the camera is waterproof. It is designed to be safely used in the rain and cold, not underwater. The parking lot video illustrates the intended design goals of the camera (except for the part where he wipes the lens with his shirt). If the camera in the creek video survived repeated dunkings that speaks very well for it but I wouldn't do it.