During july 1950, in Florida, ex-marine Halley Hamlin tested the "Egg" a personal mini submarine that he built in his garage in Cortland, New York.
Made of boiler palte, this submarine was 13 feet long, 6 feet high and had a capacity of two men. It had battery-driven propellors for swimming and caterpilar tracks for crawling on the ocean's bottom or the shore.
The inventor claimed that it ould cruise 20 miles udner water and carry enough oxygen for 64 hours.
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