On 12 February, Freddy Zervoulakos, a 19-year-old Greek-Filipino, slipped out of the camp and made contact with the guerrillas. He was sent back into the camp with the promise that the internees would be rescued. But the internee committee decided that it would be best for the prisoners to do nothing. A week later, another escapee from the camp, a civilian engineer named Pete Miles, gave further valuable information to the 11th A/B Division planners, including the daily routine in the camp, details of troop positions and the exact location of the internees. This proved a great asset to the planners and enabled them to finalize the four-phase plan that was timed to coincide with the guards' exercise period, which was conducted by the Japanese troops without clothing, equipment, or weapons, thereby minimizing the risk of harm to the internees during the rescue. Meanwhile, two lieutenants made a reconnaissance of the drop zone with the guerrillas and the two internees.