Despite thousands of years of human existence on Earth, much of the ocean remains unexplored, leaving the possibility for new and exciting discoveries.

Archaeologists recently found the remains of a medieval soldier at the bottom of Lake Avea in Lithuania, complete with personal possessions, including knives, a sword, uniform, and leather boots. The discovery provides insight into the military forces of the past, with the sword allowing archaeologists to estimate the discovery dates back to the 16th century.

In November 2020, scientists discovered an ancient lake bed more than a mile below the ice in Greenland, which could contain bacteria and other information about the world's past. However, drilling through the ice is currently nearly impossible and expensive.

In 2018, scientists announced the discovery of the world's largest underwater cave in Mexico's Yucatan Peninsula, measuring 215 miles and containing over 100 artifacts. The cave system may have been familiar to the Maya, who lived in the area.

The US Navy sunk German uboat 166 in the Gulf of Mexico during WWII, and the well-preserved wreck was discovered during a pipeline survey in 2001. However, the Deepwater Horizon oil rig disaster in 2010 accelerated the disintegration process of the wreck.

The wreck of the Japanese cargo ship Fuji Maru, built in 1938, is also a popular dive site at Chuuk Lagoon in the Central Pacific Ocean.