A method and system for detaching one or more compartments attached to a watercraft in response to a detected event, the method including detecting an event with respect to a compartment attached to the watercraft and causing, in response to detecting the event, a release of one or more attaching members that attach the compartment to the watercraft. The system is controlled to display the present image captured by the camera or a past image recorded on the recorder. The net may or may not be immediate turn to become \u201cnet bag\u201d to waste fallen leavesdebris.