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| | chapter7 |
 | | Their extraction is made possible with the help of drill holes (petroleum, gas, sulphur and other accompanying minerals); hard surface dredging, hydraulic or similar engineering methods (metalliferous deposits, silts, pavements, etc.) and solid, buried deposits which are extracted from underwater mines (coal, iron ore, tin, etc.). |
 | | Petroleum derricks were constructed over drilling holes in the Gulf of Mexico, connected to the shore by wooden bridges, thus starting commercial exploitation of underwater oil deposits. |
 | | Petroleum and natural gas are being searched for on the shelves of the Canadian Arctic archipelago, north-east Greenland and the islands of the Spitsbergen archipelago. |
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