Long dismissed as too expensive or impractical, mining the sea floor for metals is gaining a new foothold. Mark Schrope reports on two companies hoping to take the plunge. When the riches of the land run out, look to those of the sea. That's how many have thought for years, although mining the deep sea for metals always seemed a prospect of the distant future. Now, two companies are making a bid to turn dreams into profits by mining massive deposits of copper, zinc, gold and silver on the sea bed.
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