Unit 1 - Level 4 - Lost Installation (Secret Level)
Once inside, blow away the Enforcers on your upper left and enter underneath there to collect the Armor Shards and health - but stay in the corner until the laser blasters stop shooting from the wall (this is a trap). Jump across to the clear again but peak around to find the shootable glowing button above the blasters. Once activated, this opens a secret compartment to the left with knee-deep water and a destroyed cave. There are Armor Shards and Adrenaline down here. Take the platform back up - the blaster trap is now turned off.
