Daniel had traveled to P3L-997 as part of a relocation project. The planet's moon was in a decaying orbit, causing severe seismic disturbances and weather anomalies on the planet. When the Avenger virus shut down the stargate network, Daniel and the inhabitants were trapped, unable to dial out as rising waters threatened to flood the main city within hours. Once the gate system was restored, Daniel was able to relocate the planet's remaining inhabitants to the Alpha Site.
Cross Reference: Avenger
Episode Reference: Avenger 2.0