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This the walkthrough for Alien Soil.
Start by killing the Shriekers ahead, and then kill the following Leviathans. Killing the Leviathans is simply a matter of shooting them enough times, at this stage. After all the Leviathans are dead, get the bots to hack the orbs. Beware as this will attract more Shriekers. After that, you will be in an arena. The challenge ends when the dropship is destroyed.
A common glitch occurs when one orb is hacked and the other is not. The effect of this glitch is that swarmers continue to appear, until two invincible swarmers appear, and no more will come out of the ground. However, you cannot be overwhelmed, as mashing the square button is enough to keep them at bay.