PHILIPPE PSAILA / SCIENCE PHOTO LIBRARY PHILIPPE PSAILA / SCIENCE PHOTO LIBRARY
Underwater archaeology. Scuba diver about to deploy a magnetometer used to map underwater ruins. This was part of a project led by the French marine archaeologist Franck Goddio, which mapped the Royal Quarter of the ancient city of Alexandria, Egypt. The area is now submerged in the modern city's Eastern Harbour.
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