ALEXIS ROSENFELD / SCIENCE PHOTO LIBRARY ALEXIS ROSENFELD / SCIENCE PHOTO LIBRARY
Research submarines Remora 2000 (left) and Thetis exploring an ancient wreck. Several pottery amphorae (jugs) are seen at lower right. These submarines are designed for the exploration of wrecks and other undersea investigations. Each can hold a pilot and an observer, and can descend to a maximum depth of 610 metres. Photographed off Marseille in the French Mediterranean Sea.
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