One of the most expensive piece of cargo on Titanic was and is "The Rubaiyat of Omar Khayyam". A jewel encrusted gold plated book that has a bunch of ancient sayings in it. (I)Don't really know what religion it belings to, but i think somewhere around the Middle East/Central Asia area. Can you imagine if that is found? It will be easy to identify (Gold). FYI: For those who don't know, gold does not rust in salt water.
How about that for an eye opener