We encountered this type of cache in our North/South trips. I found different types, here is one of ours that we built. This is a great cache for using specific gravity, buoyancy, and the universal solvent of Wawasee Lake at the W.A.C.F. You will be looking for a small match container, and you must use water and wits only to get it, do not alter the cache. Good Luck and have fun...don't fall in! You may have to figure out a couple of things before you get the bounty. Water may not be obtained from any building faucet. Be sure you practice CITO in this area, and return the Waterbuoy device in proper position for the next adventurer to enjoy. Do not tighten the device's top too tight when finished.