Pearled Harbor took place on December 7th, 2021 (the 80th anniversary of the attack on IRL Pearl Harbor) when the player KnotNSA insided Columbia on behalf of Kallos. Allegedly, the event stemmed from a personal dispute between Knot and the Columbian player Doommad. During the course of Pearled Harbor, Knot entered Columbia's vault (The Crucible) and released the vast majority of the pearls held within.

Pearled Harbor
DateDecember 7th, 2021
Location
The Crucible,  Columbia
Result Dozens of pearls freed, major damage to Columbian treasury.
Belligerents
 Kallos  Columbia
Commanders and leaders
ColumbiaShadedoom
Units involved
1 insider 1 vault
Casualties and losses
None All but 4 pearls and some Iron Blocks

This included pearlees from the Infinity War such as NATO fighters, Ohio players, CompassCraft players, and more. Among those freed include Lowtuff, who was pearled for violating an exclusion zone in the far northwest of the map, and Kdeeks, who was pearled at the end of the Columbian Bush War. The only players Kallos refused to release during the event were the Rhodesian player Jfkvius, CivUniverse creator JustIan12, BlackManDiggy, and SirCrowley.

Knot also allegedly burnt the majority of the wealth guarded within The Crucible, causing Gregy165 great distress. The repercussions are currently unknown, though it is likely that the once-close relations Kallos and Columbia had are severely damaged. There is also speculation that Pearled Harbor may spark a wider conflict between AMIGOS and the UDF.