This cache requires that you learn about Archimede's principle in order to sign the log.
It is named after Archimedes of Syracuse, who first discovered this law. According to Archimede's principle, "Any object, wholly or partly immersed in a fluid, is bouyed up by a force equal to the weight of the fluid displaced by the object."
So you will need 20 ounces of water to obtain the cache log container but you must be quick or you will see the cache go down the drain. A 20 ounce pop bottle filled with water works the best.
Bring your own writing tool.
When signing the log sheet please use you initials when signing to save space on the log sheet.