The Bahamas

Cool Facts!
 
The Bahamas was the first country to have an underwater post office from 1939 to 1940. The seafloor post office was actually a submarine sphere used for filming underwater scenes such as the ones featured in "Jules Verne's Ten Thousand Leagues Under The Sea". Chiefly meant for tourists, the seafloor post office allowed tourists to get a breathtaking view of marine sea life and send a souvenir postcard home with an exclusive seafloor post-mark.