Nestled in the lush landscape of Oahu, Hawaii, the Tetsuo Harano Tunnel on the H3 Freeway is more than just a passage through the island—it’s a testament to engineering marvel and natural beauty. Opened in 1997, this 4.1-mile-long tunnel cuts through the Ko’olau Mountains, offering a unique journey beneath a verdant canopy. The Tetsuo Harano …