But that might be for the next one . '' Mendham High School student Justin Beckerman builds one - man submarine . The submarine can grow to 30 feet and travel at two and a half miles per hour . Inventive teen has also built boats , cars , robots , and architectural constructions .
Mendham High School student Justin Beckerman builds one - man submarine . The submarine can grow to 30 feet and travel at two and a half miles per hour . Inventive teen has also built boats , cars , robots , and architectural constructions .