365 Days of KirbyTech, Day 57: Doctor Doom's Di-Lithium Thermal Mine

Panel from Super-Villain Team-Up #6 (June 1976), script by Steve Englehart, pencils by Herb Trimpe, inks by Jack Abel, colors by Janice Cohen, letters by Tom Orzechowski
"Its tactical advantages are enormous!" Probably because it's a freakin' Di-Lithium Thermal Mine.