So I am replaying FFIV on a ROM, and I think I may have broken the game - ruining my single save game (I know, I know, I should use more than one).

So I was at the point in the game where I got the drill installed on my Underground airship and went back above ground (I had just beaten the Crystal Cave and gotten the Big Whale and all that). I went back underground to complete the Excalibur, but I used my original Falcon airship (since I had been forced to use the hovercraft earlier in the Excalibur quest). After getting the sword from the blacksmith, with my hovercraft and airship parked next to his little shop, I saved and quit.

When I came back to my game, the hole back up to the above-world had closed, and I was trapped underground in a drill-less airship. Is there any way to fix this?

Is my saved game totally screwed?