Ever wondered what secrets lie beneath your feet in the bustling train stations of Tokyo? There’s a hidden floor in Korakuen Station that’s sparking curiosity—and it’s not for the faint of heart. But here’s where it gets intriguing: this floor, labeled ‘B3,’ exists in plain sight yet remains off-limits to the public. What’s the story behind it? Let’s dive in.
It all started with a curious message from a reader to our Japanese team: ‘There’s something that’s been bothering me on my commute, so could you please look into it?’ The reader had noticed an elevator button marked ‘B3’ while transferring from the Marunouchi Line to the Namboku Line at Korakuen Station. Despite the station’s complex layout, this floor seemed out of place—and the reader was too hesitant to press the button. That’s where we stepped in.
Our investigation began with a trip to Korakuen Station, where we were greeted by a striking wall mural resembling a castle from Dragon Quest. It felt like the perfect backdrop for our adventure, though it also hinted at the challenges ahead. Japanese train stations are often jokingly called ‘dungeons’ due to their vastness, and this mural seemed to dare us to uncover the mystery of B3.
Navigating through the station, we soon found the elevator in question. It looked ordinary enough, with buttons for B1 (Ticket Gate Floor), B5 (Toei Subway Connecting Floor), and B6 (Platform Floor). But there it was—the elusive B3 button, unmarked and unexplained. And this is the part most people miss: pressing it didn’t light it up; instead, a calm voice announced, ‘There’s no stopping on that floor.’ Awkward? Absolutely, especially with other passengers watching. But our curiosity wasn’t deterred.
As the elevator descended, we captured footage of B3. True to the announcement, the doors didn’t open, but we glimpsed a brightly lit, eerily empty space. It felt like a scene from a zombie game—desolate yet foreboding. A closer look at the door sign revealed the truth: ‘変電設備’ (Electrical Substation Equipment). Here’s the controversial part: while this floor is clearly not for public use, its existence raises questions. Why include a button for it in the elevator? The answer lies in accessibility for maintenance workers, who likely use special keys, codes, or permissions to reach this critical area.
Substations like this one play a vital role in converting high-voltage electricity into a usable form for the station’s operations—lights, escalators, trains, and more. B3 is essentially the station’s heartbeat, hidden in plain sight. But here’s the thought-provoking question: Should such essential infrastructure be more transparent to the public, or is its secrecy justified for safety and efficiency? Let us know your thoughts in the comments!
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