
With huge chains and honking cranes, that's how. Example: This Republic of Korea Navy's corvette—half of it, actually—floating over the sea's surface. And before you cry "PHOTOSHOP!", check out the scene from a distance.

Click to viewIt's the Cheonan, a South Korean Pohang-class corvette that broke in two on March 26. According to an international investigation, the cause was a torpedo fired from a North Korean Yeono class miniature submarine, killing 46 crew members. A few weeks later, on April 15, the South Korean Navy recovered the stern part from the bottom of the sea using a giant floating crane. On April 24, the bow was recovered.
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Cheonan sinking information from Wikipedia
DISCUSSION
Oh hey, I've seen that crane before. It's how Sally Struthers gets her pants on in the morning.
BTW, does the torpedo count as an act of war?