2. Underwater Navigator
A new underwater navigator is currently being tested by the Russian Navy. The device can work in depths of over 80 meters (262 feet) for more than 7 hours, providing underwater navigation and communication between groups of frogmen. The special feature of the device is biometric sensors that measure the heart and breathing rates of divers and transmit them back up to a base. The navigator weighs only 7 kg (15 lbs.), which makes it extremely easy to carry around underwater.