The original idea was to have people sign the outside of the tube or attach a slate to the tube which would allow them to sign and easily replaceable. I now see I have to find something to fit inside or not register them. The guidelines state that the log be replaceable. Does this mean if I put a smaller slate inside the cache, it can be removed, cleaned and replaced to make room for more people to sign
I have found only a handfull of underwater geocaches while living in the Caribbean but never logged any because I didn't know about it. They were mostly statues and attached logs or boxes with trinkets in them. I joined this forum when I posted my question.
The point of using PVC pipe and signing of the container would allow divers to open underwater. One of the caches I found in TX had to be brought up, opened, closed, and brought back down. We will be placing some of these on shipwrecks 100-140ft deep making this impossible.