The Underwater Detection Unit (UDU) provides high definition sonar imagery in a rapidly deployable fully integrated package. With a range of 450 feet, the Deep Development Corp. UDU provides sonar imagery similar to that of medical ultrasound equipment, allowing an untrainer operator to easily interpret an image. An optional underwater hailing system is also available that allows for one-way communication with a diver or underwater threat. This fully integrated, turnkey sonar designed for use in underwater security operations, dive monitoring, search ' rescue, etc. includes all the necessary components for mounting the sonar head, cabling, interface connections and tablet PC to view and process sonar data.