The Corinth Canal in Greece is the world’s deepest man made waterway, with walls soaring 79m (260 ft) tall and some areas as narrow as only 25m (82 ft) wide.

Engineering geologist, Haris Saraglou, inspects the canal to ensure it is stable for large ships like this 195m (640 ft) long cruise ship, the largest ship to ever attempt to cross the canal.