Dive summary:

• German structural engineers issued a warning that winds blowing over 63 kph (39 mph) could cause a catastrophic roof failure at Engenhão Stadium in Rio De Janeiro because corrosion has attacked steel tubes that form the backbone of the roof structure.
• The soccer venue is being converted into a track-and-field facility for the 2016 Summer Games.
• The circular tubes – two of them 221 meters long and two of them 163 meters long – must be repaired or safety, Rio Mayor Eduardo Paes ruled, but he and Olympics backers all say the conversion will be ready in time for the games.

From the article:

The João Havelange Stadium .. has been plagued by problems since its construction for the 2007 Pan-American Games. Originally budgeted at $40 million reais, or about $20 million, Engenhão came in at $380 million reais, or about $191 million.