So, the Sorceress Of Zoom and pals are trapped in a collapsing cave, with no way out.
Yeah, right. Of course there's a way out--this is THE SORCERESS OF ZOOM!!
So, Mu locks her in a cave, she materializes a cloud city inside the cave and uses it to bust out, so materializes a volcano (in a swamp!) beneath her, so she turns the volcano into a huge pump to drain the swamp.
Look upon your grandparents and great grandparents with new respects, folks--they were trippin' some serious balls in the day.
From Weird Comics #11 (1941)