GTA San Andreas 100% Walkthrough: Mission 84 - Dam and Blast

One of the things for the heist work out is have no light inside the Caligulas during it, in order to help the team's infiltration. The Sherman Dam is the station that distribute electricity for whole Las Venturas. So our mission is infiltrate the dam and plant some charges on the electric batteries, in order to shutdown the power during the heist.

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I completed this mission a handful of times without alerting the guards.