SFS Standard Rapid Excavations Feat 13

Source Galactic Ancestries pg. 59
You drill through the earth with great speed. During your daily preparations, select an implement you use for mining, like a pick, drill, laser, or razing weapon. You gain a burrow Speed of 15 feet while holding or wielding the item, or 20 feet if the item expends ammunition or charges when used.

Traits

Dwarf:A creature with this trait is a member of the dwarf ancestry. Dwarves are stout folk who often live underground and typically have darkvision. An ability with this trait can be used or selected only by dwarves.