Which regions did Jacques Piccard explore?

This Swiss scientist plunged, in bathyscaphe, into the deepest part of the Pacific Ocean.
With US Navy officer Don Walsh, he broke a record of descent, reaching 10 910 m deep in the Marianas Trench, the deepest underwater valley.

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• Marco Polo was only 17 when he began the difficult journey from Europe to China.
•  Livingstone was the first European to see Victoria Falls in Africa. 
• In 1863 John Hanning Speke proved that the Nile had its source in Lake Victoria.
•  In 1969, two American astronauts, Neil Armstrong and Edwin Aldrin, set foot on the moon. 
• The brothers Verendrye two Frenchmen, are probably the first Europeans to see the Rockies, around 1740