As a result of the teleporter's destruction, Calhoun enters a 'harmonic reflux', causing him to be rapidly teleported to a variety of locations in Xen and Black Mesa. Calhoun is the last to enter the portal and as he does so, Marines breach the laboratory and fire on him, causing the teleporter to explode. After returning with a new power cell, Calhoun assists Rosenberg in evacuating the few surviving personnel through the teleporter. Upon his return, Rosenberg informs Calhoun that the teleporter's battery power has been exhausted, and contact has been lost with a team sent to acquire a new power cell.Ĭalhoun travels to the power generators on a lower level to find a fresh power cell while firefights rage between the Marines and the forces of Xen. Rosenberg then teleports Calhoun to the Xen border world to calibrate research equipment needed to pinpoint a teleport destination outside of Black Mesa. After freeing Rosenberg from the captivity of the US Marines detachment sent to silence the facility, Calhoun escorts him to a decommissioned prototype teleportation laboratory, where several Black Mesa employees have already gathered.

Rosenberg and his colleagues plan to escape the facility using teleportation technology. Emerging near Black Mesa's classification yards, Calhoun learns that Dr. The elevator is badly damaged and fails, sending Calhoun plummeting into the depths of Black Mesa.Ĭalhoun regains consciousness at the bottom of the shaft and begins to fight his way to the surface to escape. As Calhoun finishes repairs, however, Freeman's experiment takes place and results in a 'resonance cascade', causing massive damage to the facility and teleporting alien creatures into the base. After reporting for duty, Calhoun is instructed to assist in maintenance on a malfunctioning elevator. Blue Shift begins in a similar manner to Half-Life, as Barney Calhoun rides a train through the Black Mesa facility to reach his place of work.

Half life blue shift walk thru