Things I had no idea existed...

So I've been reading Superman comic books monthly since 1992, and have been avidly collecting his back issues for the past 14 years or so, but every once in a while I come across something I've never heard about before in the Superman mythos.

Something like Hideout X-1!


That's right, it's a secret conference room hidden inside the Daily Planet globe. Apparently, it's a meeting place for Superman and Batman to get together every once in a while?

In this particular story, Superman is double-crossing a thief by pretending that this is a good place to hole up and wait for the heat to die down, knowing full well that Batman is due to show up soon!

So has Hideout X-1 ever shown up again?

A quick, cursory google search came up empty, but someone out there knows for sure one way or the other.

Script by Cary Bates
Pencils by Curt Swan
Inks by George Roussos

Action Comics #384
The Forbidden Costume!
January 1970
Copyright (c) DC Comics