The quake seriously damaged the control tower at Toussaint L'Ouverture International Airport[11] and the Port-au-Prince seaport.[12] Reported damage to the seaport included the collapse of cranes and containers into the water, structural damage to the pier, waterfront quay areas collapsing into the water with crevassing and slumping of level waterfront ship-unloading dock-work areas, container cranes leaning because of ground subsidence, and an oil spill, rendering the harbor unusable for immediate rescue operations. The Gonaïves seaport, in the northern part of Haiti, remained operational.