Submerged GeoCaches (underwater) containers in General geocaching topics Posted July 2, 2010 I am looking for opinions on the best underwater GeoCache container. The limitations I have for an underwater cache is that I need to place it below the potential ice level (<2ft). The current container being tested is similar to a Pelican case. After almost 2 weeks submerged, with the temperature fluctuating from ~5'C to ~25'C, it is showing signs of moisture. Has anyone hidden a submerged cache, and what did you use for the container? How is it holding out?