Summiting Greece’s towering Mount Olympus is an impressive feet for the 1-million-plus people who have accomplished the climb. But it would be even more impressive if they could do it underwater.

Ancient Greeks saw Olympus as a divine realm of Zeus and the gods, not a mountain. Its link to Mount Olympus emerged in later traditions.

The seamount rises 3,109 meters from the ocean floor, nearly four times the height of the Burj Khalifa and taller than Mount Olympus in Greece. The discovery was made during a 28-day expedition ...