Dig

Dig is a creature spell in Dungeon Keeper (and is part of Hand to Hand in Dungeon Keeper 2). This is a basic ability of the Imp and allows it to dig through earth and other slabs whilst in possession, as well as claim path. Digging is the most used feature in the series, as it's required to carve out the very foundation of a dungeon.
==General Information==
=== Dungeon Keeper ===
Dig is a creature spell unique to Imps. It causes the Imp to dig through the tile in front of it and does not damage enemies. It can be used while possessing Imps to dig out areas more quickly than they would by themselves. Despite the name and ingame description, one can also use this ability to claim dirt path connected to your territory. However, it is not possible to use a possessed Imp to claim enemy or neutral claimed tiles or rooms or reinforce walls (however, these are possible from KeeperFX 0.4.9).
Tunnellers, despite being able to dig by themselves, do not possess this spell; therefore, they cannot dig tiles out in possession. There are two reasons for this: 
* Internally, tunnelling and digging are actually discrete (strictly speaking, hero Tunnellers tunnel; Tunnellers only dig when converted to a Keeper's side): although they have the same effect when done to earth or reinforced wall tiles, they have different sound effects. This is noticeable when a Tunneller's digging sound changes to that of the Imp's after he's been converted; it's because he's now digging rather than tunnelling.
* This spell is for first-person digging; digger creatures (Imps and Tunnellers) can dig and claim of their own accord, which doesn't require or use this spell; it is a separate ability. This is noticeable when you're querying an Imp whilst he's digging; this spell is not used. Also, different rules apply when using this spell; claiming a floor tile takes precedence over digging a wall tile when this ability is used, even if you're right in front of a diggable wall tile, and there's no way to override this.
==== KeeperFX ====
In KeeperFX, Tunnellers also have this skill, making them slightly more useful if converted. The name becomes even more of a misnomer: possessed creatures can also claim rooms (a small counter appears at the top of the screen to represent a room's health), pocket gold, pick up spellbooks, Dungeon Specials, trap crates and unconscious/dead creatures and drag them around, and if a player holds the key, they are also able to reinforce walls and claim without fear of digging.
=== Dungeon Keeper 2 ===
In Dungeon Keeper 2, Imps and Dwarves can still dig through walls and claim land, but the skill is merged with the creature's regular attack.