Use some water, a sponge and some elbow grease. I harbor a strong disdain towards this individual at the moment.
That's when Spivak ran into a werejackal in a corridor.
The werejackal had a wand of digging and decided to zap the ground to escape Spivak's corroded +1 mace. Now Spivak had the choice of waiting to enter the Gnomish Mines or to attempt level 5 and finish off that persnickety werejackal. The werejackal seemed like a good idea so she jumped in the hole after him.
He had a wand of magic missile and then zapped another hole in another room to escape to dungeon level four. Upon ascending back to dungeon level two Spivak realized she has no way, short of digging or teleporting, to the stairway leading into the Gnomish Mines.
So get ready for dungeon level five.