It's not Bruce's fault that most other humans haven't put in the work that he has. Everyone else is perfectly capable, they just haven't bothered. What's the point of getting himself here if he doesn't ever flex, man.

"The ceiling will probably hold," he says, and isn't ... actually sure. It would be a hitch in the experiment if Clark ripped straight through to the surface, but at least they aren't working in a basement downtown. If Bruce weren't cognizant of the very real potential of one or both of them accidentally needing medical attention from a professional if this goes sideways, they'd be off in his frozen fortress of alien solitude instead.

But it'd be a shame to rip a hole in that, too.

"I promise it's not cancer."