As oceans swell around them, some of the world's tallest manmade structures live in water, not on land. There's not a whole lot of variety when it comes to this manmade mammoths of the sea. Most of theses mega-builds draw oil from the depths, the only purpose as yet discovered that's lucrative enough to pay for their out-sized cost and complicated engineering. One more thing they have in common is that they all can wow with impressive size. We look at seven of the most intense and impressive offshore structures across the globe.
1.Berkut Platform
2 Perdido Platform
3.Olympus (Mars B)
4.Troll A
.5. Hibernia Platform