Blue Marlin carrying USS Cole. Wikipedia
Meet The Cruise Liner For Ships! Massive Carrier Craft Can Hold Up To 22 Barges - And Even An Oil Rig - On Its Back -- Daily Mail
When you need to transport 22 barges – each weighing nearly 3,000 tonnes – half way around the world, you're going to need a pretty sturdy boat.
And they don't get much sturdier than the Blue Marlin, one of the most extraordinary crafts ever to sail the seas.
The incredible ship can carry 75,000 tonnes. Rather than the usual cargo of toys, TVs and coffee, it carries other ships and oil rigs.
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My Comment: Impressive .... and for the U.S. Navy .... essential.