Provided is a robot control method that controls a robot to guide an evacuation route in response to occurrence of an emergency situation. The robot may acquire evacuation route information on a space from a server when an emergency situation occurs in the space, and may move to a first node closest to the robot among nodes defined in the space and a second node indicated by direction information of the first node based on the evacuation route information and a current location of the robot.

An unmanned device for a marine environment comprises a location sensor configured to gather location data corresponding to the unmanned device; at least one propulsion system; a transmitter and memory including computer program code. The computer program code is configured to, when executed, cause the processor to cause the propulsion system to propel the unmanned device in a pattern along the body of water, cause the sonar transducer to emit the one or more sonar beams into the body of water, receive sonar return data corresponding to sonar returns, and generate a sonar image corresponding to the sonar return data. Further, the computer program code is configured to cause the processor to detect an object within the sonar image, assign a score to the object indicating the likelihood that the object is a desired object type, and send an alert to the remote electronics device upon assignment of the score.