Splash Damage and Nexon have just confirmed two closed beta tests for the upcoming PC-only shooter, Dirty Bomb. More than 100k players are said to be invited to the limited-time events, which are taking place between February 20 - 23 (5pm GMT start and finish), and again on March 6 through to March 9 (also 5pm GMT start and finish). For more details on the future-London shooter, or to sign up for a place in the beta, click here.