Yup, I'm* fully expecting someone to shapesand up the appropriate tool, though I could probably use pitons and rope to achieve a similar effect if necessary.
I also wanted to open up the subject for discussion rather than jumping to the "open trapdoor and possibly alert people to our presence" portion of the proceedings without consulting the party first.
*I the player, that is. Korth doesn't know his party mates are carrying shapesand and probably wouldn't be all that familiar with the mechanism involved here (do Dragons have sewers?), Engineering skill notwithstanding.