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I'll take "Mind-bogglingly, awesomely huge", for $400, Alex.

What is the biggest heavy-transport ship in the world, capable of carrying an entire oil-drilling platform or the destroyer USS Cole or a stack of twelve cargo vessels on its cargo deck?

This is serious big-engineering porn.  Don't miss the video of the ship semi-submerging in Rotterdam harbor so the palletload of a dozen ships can be tugged off it.
When one needs to transport a large number of ships (perhaps they aren't ocean-ready), move a gigantic oil rig (like BP's Thunder Horse PDQ) or perhaps carry a damaged warship home (The USS Cole), ...
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Funny, I was discussing this with my wife over lunch today.  It's a ship-shipping ship, shipping shipping ships.
 
+H. Peter Anvin
Actually, to be pedantically correct, it seems to have been designed for shipping oil rigs. But I like your version better.
 
Well, it has certainly been used for shipping shipping ships (mostly river ships, that aren't built to cross the ocean under their own keel, I gather.)
 
+Lance Berc
Thank you! I thought that was a radome on top in the first picture, but couldn't figure out what one of those that size would be doing on a semi-submersible rig.
 
I think that platform is now near South Korea the last time I checked. 
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