Several years ago was detecting on a beach on Connecticut shore. After several minutes of nothing, decided to sit for awhile and simply enjoy the view.
After few minutes, happened to look at some shells washed up on the high tide line and there, sitting just as pretty as can be, was several coins. Each coin was sitting on top of miniature column of sand, like a volcano. No detecting necessary.
Evidently, weight of the coins was enough to hold down the sand directly under coins, while wind eroded all the sand from all sides. Total take was 1.74.
A neat thing to see.