one of man's greatest inventions has been the submarine using the entire ocean as i ding brace he hits hard and then she runs fast now it should she be spotted at the surface and she has the capability of submerging very very quickly usually in less than about board the submarine there is no time for error the crew lady acts as one man the complex operation of the three hundred ten foot ship such as this is possible only through training discipline and constant attention to duty admiral chester nemesis always or early on delighted to be aboard participate in this program i heard you say that the submarine was one of man's greatest inventions that might be that and the most evil one too much submarines have ironed the place than the neighbors of the worry of their effectiveness in world war one and world war two moves around them a place and the neighbors of the world for the predictable future they have many capabilities and one of the people who is most competent to tell you about those capabilities is here in your studio tonight admiral charles rock what you know are natural i was very interested in reading the board she has enormous storage batteries all along the keel here which produce power far diving or submerged on other words then if you don't have one of these norco's and you want to go below the water then you have to use the batteries for that sort of  minimum are they're able to sell the submarine for about one hundred one hundred miles and then of course you have to come back to the service and recharge the batteries that's correct except that when you have a snorkel you can charge  to mention one of the most intricate training devices that i've ever seen it's at the marilyn submarine training facility and actually what it is is an operating section first of all of a control room and then above that on the next  and way up here what would be the service of the ocean as they have a floor on which mall models of ships move about so that the periscope air can do the tracking of those boats up there let's see how that works by going first of all to this training facility right here at the control and you'll notice that the deck is marked off and nautical miles and across that move the little electric power dollars or crabs or they're called and on top of each crab is a model of an enemy ship your battleship or carrier or destroy crabs can move at preset direction and speeds which are scaled to the actual speed of ships  focus on the target below now and watch this operation through the periscopes coming around course the crew is down there working as we saw a little bit earlier now are on the up periscope of course the skipper again makes a complete circle to scan the horizon and then he focuses on the targets and very soon the targets comes into view this case that happens to be a heavy cruiser which has been moving across the deck mounted on the top of that crab most genius arranged right here of course is one of the scraps of the type we're looking at you see on the top here is the author the model on which the skipper was focused and the mechanism is done here which moves in any direction whichever is desired according to what is set up on the bubble on the keel let us device the operators can take up underwater sound much as a radio picks up sound waves in the air and then by the character  sound you can tell what sort of an object is out there in the water either ed of your any other place in the area that's why are they good sonar operator can tell the difference between a propeller sound of a carrier and those of a destroyer of course we should mention sonar system also is able to send out the supersonic waves and those go out in an object and knowledge back to the submarine and by the interval of time elapsed from the time they leave the ship until they come back we can calculate the our way that object might be what suppose we listen to some of the things we might hear from a submarine if for example we were listening to a commercial ship such as a freighter the sort of a beat that we would air from the propellers and followed by the beat of a faster ship such as a