Long story with several twists and turns.
Shortened up? They are being used as suicide assets by a top Corporate R&D Head. After using them a few times on normal runs, he NEEDS them dead for his own safety and interests, but also knows they are damned capable, since they downed his first attempt, a "Test" Fight (they didn't know the safety measures were.. off) against a new war drone/vehicle hybrid. So now he's sending them in against this supposed hive, hoping either what's down there offs them, so he won't have to risk his own men checking it out... OR they somehow succeed, in which case, 'imagine that! Time to take credit!'. He isn't exactly seeing too far in to the endgame that if they ARE this good, it can only end badly for him to be sending them off on these "rigged" runs.
He's kept them under his thumb so far, but he's making the mistake of not sending one of his own with them this time, giving them prime opportunity to escape his clutches, especially if they catch wind at the odds he's putting them against for trifle pay (the decker is close to figuring it out)