Around the island, you'll find towers you need to access. The access codes for those towers are provided below.

161803 - Central Tower
214808, 534211, 628620, 706798, 803482, 899862 - West Island Towers
097494, 419716, 459230, 510582, 781640, 939937 - East Island Towers
846264, 950288, 979323, 265358, 314159, 338327 - South Island Towers