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Why go through the Panama Canal? Why do we have to go up one level at a time instead of going straight through? First of all, we have to understand. The Panama Canal was built. It allows ships to travel 15,000 kilometers less between the Pacific and Atlantic Oceans. 15,000 kilometers less, making it one of the seven engineering wonders of the world. So why not use the simplest method? Why not use the simplest method? The French tried it in 1892. But due to poor geology and weather conditions, it took nearly eight years, at a cost of nearly $300 million and the lives of 22,000 workers. The French had no choice but to abandon the project. But the Americans who took over came up with an idea. They proposed not to dig the mountain deep. Instead, they proposed to level the mountain and then build two dams, one at each end. That way, it would create an artificial lake above sea level. Ships can cross the Isthmus of Panama. That's the problem. How could ships get up to the surface of the lake? The clever designers came up with a multi-stage lock system The ship first enters the open first stage. After the first lock is closed, open the valves between the two locks, connecting the water between the two locks, automatically matching to the same level. Then the secondary sluice can be opened. Allow the boats to enter. Repeat the above steps. The boats will be brought into the top man-made lake. Once the boat has crossed the lake, the same process is repeated at the other end. It will be lowered to sea level. Nowadays, to ensure the safety of boats and canals, the boats are towed by tugboats to the locks. Two more tugs adjust the lateral orientation. Four electric locomotives will be connected before entering the locks. The boats will be towed along the railroad tracks on both sides of the locks, avoiding collisions with the locks.