Several inmates housed in the recently opened organised-crime wing of the Vendin-le-Vieil prison in Pas-de-Calais deliberately flooded their cells during the night of 27–28 August, allowing water to spill into three of the unit’s four landings, according to representatives of the FO and Ufap prison officers’ unions. No cells were opened, but guards spent hours clearing water. Union official David Lacroix described the action as a coordinated protest against conditions in the high-security quarter, which holds 88 detainees transferred to Vendin-le-Vieil between late July and early August. Dozens of those prisoners are already challenging their transfer in court and have threatened to begin a collective hunger strike on 1 September. Ufap called for “firm disciplinary sanctions” and additional measures to prevent further disruption. The prison administration had not commented publicly by Thursday afternoon. The flooding followed another security incident earlier in the day at the Lille-Annœullin facility, where rubble was dropped by drone onto prison staff, underscoring growing tensions across northern France’s penitentiary system.