While it can be researched earlier, Tunneling Claws cannot be used until burrowing has been evolved.
Tunneling Claws also increases the roach's burrowed regeneration rate from 5 to 10 hp/second.
Roach warrens are available as a structure for Abathur in Co-op Missions. They do not cost vespene gas, and function as the first tech structure Abathur can construct. Upgrades for the roach and ravager can be researched here. Additional upgrades are unlocked at level 4.
The following section contains information from a previous version of StarCraft II which is no longer valid.
- ↑ 2015-03-31, StarCraft II Legacy of the Void Beta Release Patch Notes. Blizzard Entertainment, accessed on 2015-04-03
- ↑ Blizzard Entertainment. StarCraft II Map Editor. (Activision Blizzard) (in English). July 27, 2010