The major construction project that spanned the seas and connected two major oceans is the Panama Canal. Completed in 1914, this engineering feat links the Atlantic Ocean to the Pacific Ocean through the Isthmus of Panama. It drastically reduced maritime travel times by eliminating the lengthy, treacherous route around the southern tip of South America. The canal stands as a testament to human ingenuity and played a crucial role in global trade, allowing ships to transport goods more efficiently between major economic hubs.