Building collapses have become a major menace in Lagos, Nigeria. Lagos is the business hub of the country and has its largest seaport and airport. With an estimated population of 15.4 million, it is the largest city in sub-Saharan Africa and the second largest in Africa after Cairo.Building collapses have become a major menace in Lagos, Nigeria. Lagos is the business hub of the country and has its largest seaport and airport. With an estimated population of 15.4 million, it is the largest city in sub-Saharan Africa and the second largest in Africa after Cairo.Engineering[#item_full_content]