The biggest hunk of titainum I've seen is the ball of the ball valve of the TDU(Trash Disposal Unit) on a old S-Class attack submarine or first gen Ballistic missile submarine, same unit in either................I'm toasted! Chocolates kicking in!
It surprised me on how light it was. I can't grasp how expensive it must have been way back then when it was built.
You know Subs?
A guy tried to get me involved in a treasure hunt claiming that batteries designed to discharge in a burst were in certain torpedos and had many pounds of silver. AUTEC shot many into the Bahamian test range that were never recovered. Have you ever heard of them?
When I figured the resources needed to salvage anything from 3500' to almost 7000', back then, I passed.