When performing Dig, the user begins digging into whatever surface that can be dug into, such as grass, soft dirt and stone, and then disappears into the said surface; it cannot be used to dig through metal floors. After a short while, the user emerges and can sometimes bring buried objects with them back up, such as item boxes containing rings, extra lives, different types of shields or even invincibility or Power Sneaker power-ups. Mostly however, the Dig move is primarily used to find the hidden Emerald Shards or other key objects needed to clear the stage. This move can be performed while standing, climbing or gliding.
This move was primarily used by Knuckles to dig up the Emerald Shards of the Master Emerald (which was shattered and scattered after Chaos was released) which he managed to locate underground, but he could also use it to find other items such as keys to the various Action Stages. To perform Dig, the player has to press the action button and jump button simultaneously.
Sonic Adventure 2
The Dig made its return in Sonic Adventure 2 where it was used by both Knuckles the Echidna and Rouge the Bat. In order for them to perform it, they must each possess a certain upgrade; Knuckles must once again obtain the Shovel Claws while Rouge must obtain the Pick Nails.
The mechanics behind the Dig in this game is identical to those in Sonic Adventure. It also serves the same purpose by allowing the user to find Master Emerald Shards and other items hidden underground. In this game however, it is possible for the user to dig into the wall they were climbing on and find hidden rooms and passageways if they are digging the right place. To perform Dig, the player can select Dig in the action window or press the B button (O button on PS systems) while in the air or climbing.
In the remake, Sonic Adventure 2: Battle, Tikal and Chaos 0 were included as additional characters in the game's 2-player mode's Treasure Hunt Race. Due to this, both Tikal and Chaos can perform Dig by default to find hidden Master Emerald Shards, since they are not a part of the main game and therefore do not need an upgrade to perform Dig.