The Teleporter is the 20th tool in the shop, and is also gamepass-exclusive. This is currently the only tool which is not used for mining.
It acts as a deployable portal to a specified location in a mine, allowing the user to teleport to it from the surface with a click of a button. If it is manually destroyed by the user or collapses under the mine when it falls, a new teleporter may be placed elsewhere.
Teleporter "Glitch"[]
The teleporter will always appear on the top of a block when placed. This means that if it is placed on a block above the player or on the walls of the mine, it allows the player to effectively teleport through blocks (and even outside of the mine itself).
By utilizing this unintended feature, we can see that ore and stone are generated in a cross-like pattern when a block is destroyed. Mining while outside of the mine will generate more blocks outward, rather than inward (thus expanding the mine).
This is technically not a glitch, but an oversight in the tool's design.