"Are we seriously going to go down into the tunnels to hunt the warriors? I like a good hunt as much as anyone, but fighting underground is always a high-risk endeavour, and even more so when you're the one on the offence in tunnels that your enemy has created and prepared for an invasion." One of the away team members asked.
She had a good point. There was a saying among the Kepler infantry units: "Never fight in a basement." It was good advice, as a basement only had one way in and no way out if someone was attacking from above.
The sentiment extended well to fighting in tunnels since the enemy could circle behind you and leave you trapped. But that wasn't a real concern for Nico. If there were enemies on every side, it just meant that she could attack any direction that she wanted.