Transwikied from http://lifeafterpeople.wikia.com/wiki/Panama_Canal
The Panama Canal is an 82-kilometre (51 mi) ship canal in Panama that connects the Atlantic Ocean (via the Caribbean Sea) to the Pacific Ocean. The canal cuts across the Isthmus of Panama and is a key conduit for international maritime trade. Work on the canal, which began in 1880, was completed in 1914, making it no longer necessary for ships to sail the lengthy Cape Horn route around the southernmost tip of South America and to navigate the dangerous waters of the Strait of Magellan. One of the largest and most difficult engineering projects ever undertaken, the Panama Canal shortcut made it possible for ships to travel between the Atlantic and Pacific Oceans in half the time previously required. The shorter, faster, safer route to the U.S. West Coast and to nations in and along the Pacific Ocean allowed those places to become more integrated with the world economy. Now, ships are navigating in a waterway with no controllers, so, how long before a ship strikes into another? And a long the canal itself will last? We shall see.
2 Days After People: Only a few days after people, the massive cargo ship is sailing the canal but another ship is the its way. The ships are on a collision course. They finally collide. Both ships sink. In the first few days after people, collisions and accidents are multplicated.
20 Years After People: The Canal has became a man made river. Creatures like the Anaconda and the Caiman swim the Canal. Tapirs and Ocelots come to drink here.
21 Years After People: Vegetation starts to take over and the Panama Canal.
200 Years After People: In the time of humans, the canal was created in a rainforest. Now, the vegetation takes over and the Panama Canal dissapears into the forest. The Americas are united again.