In addition to the Bars & Brick, I see two cannon balls. One about 8-10 lb, and the other about 6 lb.
No doubt the large circular object on the right is man made but I can't figure out what it is?
Interesting, when I invert the photo the shadows give the ILLUSION of a portrait of a beautiful lady, and below it , upside down, a man with a short beard.
IF, the bars are Silver, it should pay the cost of a dive anyway. Let's see, $30 a troy ounce X 12 =$360 a troy pound X 20 lb per bar = $7, 200 per bar X at least 7 bars =$53,400. Yep, that should cover the cost of a dive. Dell