Shōwa Prison Camp massacre

Shōwa Prison Camp massacre (also known as the Doom of Shōwa) was a mass murder committed by prison guards and soldiers of the TT10 branch to kill every prisoner in Shōwa Prison Camo before GBS teachers could invade the North

The massacre
Reicheru, one of the commanders, ordered the massacre, and guards killed, tortured prisoners using bayonets, rifles, rape, and executions.

Aftermath
The bodies were mass graved or burnt, the team later hid in the submarine to avoid capture.