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If you can dream it, someone has built it. What makes the postcard waterproof? The postcards are a synthetic product called Syntek and the weight is 340gsm. So a plastic like product. The Syntec material is basically made of a mixture of clay (calcium carbonate) and polypropylene resin. It is non-toxic and has the look, feel and printability of paper, plus the durability of plastic. They are tough, waterproof, tear-resistant, impervious to grease, oils, chemicals and the elements. They can also withstand high temperatures and humidity.”
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Who ever would think about creating an 
April 29th, 2007
[...] From Hacked Gadgets [...]
April 29th, 2007
I’ve always been a big fan of scoobadiving, never expected anyone to do anything like that though
April 29th, 2007
We’re slowly going insane and as we fail to find anything new to do, it will speed up
April 29th, 2007
Haha, I would never of thought of this, cool idea thou. I like how they made special postcards for it, instead of just putting normal ones in a bag or something
April 29th, 2007
Paul, how about laminate em eh?
April 30th, 2007
Ah, Vanuatu, home to some of the best diving and deep sea sport fishing in the world, also where I got married. A great place.
April 30th, 2007
Hi Geoff,
Is it as beautiful as it looks?
April 30th, 2007
I like it because it’s traditional, yet practical.
April 30th, 2007
Kinda reminds me of the whole futt buckers thing from that Idiocracy movie.
April 30th, 2007
Would be awesome if they used bank-like vacume tubes to send messages and packages from island to island underwater
April 30th, 2007
o_O
So.. you write on the cards on the land, or underwater?
Couldn’t you utilize the (ex$pen$ive) space pen underwater?
This…is…so… COOL!
April 30th, 2007
[...] …stays these couriers from the swift completion of their appointed rounds! According to Gadling, the traveler’s weblog, there are no fewer than 5 underwater mailboxes around the world. Via Hacked Gadgets [...]