Where is the world's first (still functional) underwater post office?

I never heard of such a thing! That is really amazing!

I would love to see one of these!

Ya know, that's insane ya know. 😋

Who is surprised alcohol was involved in the thought process to develop this? It had to be that or acid!d

I guess everything has to be covered in plastic. Very weird!

wow 😲 great info

Player Sherry, same here! I never knew that.

'mostly a tourist attraction', as opposed to the divers who forget to mail their letters on the way to the boat and think 'oh it is ok, I will mail it while diving'.