A test bed was developed for Plum Island, NY experimental multi-sensor security surveillance. The system includes broadband radars, cameras, an Automatic Identification System receiver, geophones and underwater passive acoustic sensors. The sensors were grouped into nodes connected to a Command and Control Center via a Wi-Fi network. Some sensors are COTS, some were developed and built by Stevens Institute of Technology. Sensor network was tested for the detection of potential surface and underwater intruders. This paper presents a system description and sensor performance estimations for various targets, including jet skis, small boats, kayaks, and divers. The system design performance versus cost considerations and methods of sensor integration are discussed.