Excavate

(Underdark, DnD 3.5)

Transmutation

Level: ; Sorcerer/Wizard 8
Components: V, S, M
Casting Time: 1 standard action
Range: Close (25 ft. + 5 ft./2 levels)
Effect: One 5-ft.-by-8-ft. opening, 1 ft./level deep
Duration: Instantaneous
Saving Throw: None
Spell Resistance: No

As with passwall, you create a passage through wooden, plaster, or stone walls, but not through metal or other harder materials.
If the wall's thickness is more than 1 foot per caster level, then a single excavate spell simply makes a niche or short tunnel with the stated dimensions.
Several excavate spells can be used in succession to breach very thick walls by forming a continuing passage.
Unlike passwall, excavate is an instantaneous effect that does not end and cannot be dispelled; any passage it creates is permanent.
Material Component: A pinch of excavated earth.