Electric or electronic sensors for underwater use, namely, electric, electronic, or electrochemical oxygen monitors and sensors for environmental use; Electronic data relays for sensors; Electronic proximity sensors and switches; Environmental monitoring system comprised of meters and sensors that measure pressure, humidity, temperature and includes alarm and reporting functions; Microsensors for measurement of pressure, acceleration, force and flow, namely, silicon piezoresistive pressure sensors; Proximity sensors; Telecommunications equipment and software, namely, fiber-optic transceivers, fiber optic repeaters, converters and optimizers, wave division multiplexers, free-space optics transmission systems, switches including Ethernet switches and routers, fiber-to-the-home and ethernet-over-VDSL access aggregators, terminators and repeaters, and remote presence management products, namely, switches, and console, alarm, sensor and power management devices; Temperature sensors; and, Ultrasonic sensors