Thanks! Back in the 1950s, an evangelist who befriended the late King Hussein of Jordan did some (risky) diving in the Dead Sea, in the southern, shallow part which has since dried up anyway. He found very, very little, but still wrote a book about it. Somewhere I have the abridged version, which is something like 500 pages.
Neat.
I’ve heard/read/imagined that the Black Sea has some pretty impressive stuff under the waterline too.
I’d love to know the title of that book.