A 9,700-pound drone with 28 lights on it set a 10-inch square down on the seafloor 16,863 feet off American Samoa, scooped out the metal lumps growing inside that square, and bottled the water just above them to test whether a radioactive gas can find more - Autonocion.com
Source:Autonocion.com
If you took biology in high school, you’ve probably thrown a square frame on the ground and counted whatever landed inside it. It’s called quadrat sampling,