Video Scenes of the Panama Canal under construction 1912 via Youtube

Panama Canal Construction along the Culebra Cut.  Public domain film from the Library of Congress Prelinger Archive, slightly cropped and mild video noise reduction applied. Published by Jeff Quitney via Youtube.

The Culebra Cut, formerly called Gaillard Cut, is an artificial valley that cuts through the continental divide in Panama. The cut forms part of the Panama Canal, linking Gatun Lake, and thereby the Atlantic Ocean, to the Gulf of Panama and hence the Pacific Ocean. It is 12.6 km (7.8 mi) from the Pedro Miguel lock on the Pacific side to the Chagres River arm of Lake Gatun, with a water level 26 m (85 ft) above sea level.