Buried deep below the earth or drowned far below the ocean surface sleeps the promise of untold riches. Or so they say. The treasure-hunting gig not only promises fresh sights, puzzle solving, and a chance to make history, but it also offers the opportunity to rake in vast amounts of wealth at the end of the journey. Watching or reading about plunderers of riches old in movies or books is fun, but there's nothing quite like being able to do it for real.