The second of three star fighters launched by the Oraki immediately after the war with the Word of Creation, the Wasp is a short-flight, non atmospheric fighter designed for heavy firepower and survivability.
Cramped crawl spaces, virtually all starships have them, and usually most players ignore them. Unless a nasty alien gets loose inside the ship, even many Gms don't give them a second thought..
Here are 30 other issues that could require some crawl space access and provide an interesting sub plot.
A PC Conjurer or summoner, basically any mage whose sole purpose in life is summoning creatures to aid in battles and various situations, is cursed with a hex, and needs to find a way to undo the curse...before he goes mad, or his fellow PCs throw him out of the party, or worse.
Everything he/she summons, never goes away. So you'll have to figure out what the heck to do with that dire bear or fire elemental once it's done fighting the orcs for you. Eventually a caravan of bizarre creatures either annoyingly ends up following the summoner around, or they go off to cause mayhem elsewhere. Bad news for the poor spell-caster regardless.