Shinkansen

There’s a specific kind of quiet that settles when certain people are nearby. Not silence, but a gentle hum, a sense of everything just… aligning. It’s like the air itself softens, and my own thoughts somehow get clearer, more grounded. Just noticing that. Hello! And welcome to Saiki Saturday!! #bandmaid @saiki_bandmaid #IceQueen #OurQueen #RockSinger #Supermodel #HanshinTigers #Shinkansen #Daydreaming #ReadyToRock #Hate #ForbiddenTale #EndlessStory #FlyingHigh We Love you Sai-chan!!!

The Seikan Tunnel is indeed the world's longest underwater rail tunnel, located in Japan.

It stretches 23.3 kilometers (14.4 miles) beneath the sea, connecting the Japanese islands of Honshu and Hokkaido.

The tunnel was completed in 1988, and it was a remarkable engineering feat at the time of its construction.

It remains a vital transportation link, with high-speed trains traveling through it, including the Shinkansen.

The Seikan Tunnel is one of Japan's key infrastructural wonders and is renowned for its immense length and the challenges it posed during its construction, as it had to be built undersea in difficult geological conditions.