The Secret of Vis Electra

Reward: Disables the FOW (Airstrike at Cima Leon: Centcom)

After starting the mission, follow the pipes until you reach the base of the massic Centcom installation. There will be military patrols here that will attack you if you stay too long. Destroy them if you must then follow the end of the pipes marked by a couple of floating bouys.

Approach the gate for Dimah to hack open the submerged tunnel. Continue following the pipes inside while taking a breather from the overhead air pockets. Continue forth until you reach the facility. You can ignore the scientists and interact with the hatch controls that will open the massive hatch where the power nodes are located. Take out the guards and destroy the nodes. You can plant your GE-64s on the power nodes and/or tether the nearby explosive barrels. After destroying the nodes, leave through the other tunnel Dimah will open. Reach the checkpoint to complete the mission.

Not a secret anymore