While on a mission on Eden- 227, the squad of Agents were dealing with the people of a sadistic Reikgon cult, which was going as smooth as possible. However, the leader of the group was not ready to surrender yet. He decided to simply blow the entire facility up, taking with himthe whole squad of the Agents.
After the explosion, nothing was left at the scene, leaving everyone to belive that no survivors were present. That was a logical and an obvious answer.
However, in reality, everething turned out to be WAY more complicated, absurd and... Easier..?