Inventor tests 'one-man' submarine.
New York, U.S.A.: Semi view one-man sub on land. CU rudder. CU side fin. Semi view submarine in water..man gets in. CU man gets in. Semi view sub. going along in water. Long & gen. views periscope of sub. moving in water.
Inventions; United States of America; Ships and Boats
Background: Inventor tests 'one-man' submarine.