- Has written numerous books on the subject of searching for sunken treasure.
- Lying about his age, Marx joined the Marines at the age of 17, just after the end of the Korean War, for a three-year hitch. He was stationed in Camp Lejeune, North Carolina, where he learned to scuba dive, and began diving the wrecks along the coast.
- Searched for the USS Monitor, which had sunk on December 30, 1862, finding it in 1977.
- In 1961, navigated the Niña II, a replica of the Niña, Columbus' smallest ship.
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