When the Cell arrived at Twin hills they found the remains of a major conflict. There were bodies strew about, rended to pieces and large holes made in the structure.
Making their way inside the Cell discovered the base empty except for bodies. The conflict appeared to have happened a few weeks past, shortly after the conflict at the Cell Headquarters.
Dr. Jason Tennant was able to hack into the security system and retrieve footage of the incident.
Reviewing the footage revealed that the radar station was attacked by some sort of large humanoid.
The attacker battled the NDD and seemed to take little damage. Once the NDD were dealt with, it went after the grey. The footage showed the grey disappear and then end up halfway through a wall. At this point the attacker left.
The Cell managed to free the body taking part of a wall with them. They also found a small box contains some odd grenades. 5 of 6 were remaining.
The Cell then proceeded back to their temporary hideout and began construction of a new Underground HQ as they no longer felt their estate was secure.