More cracks have been discovered in Sydney’s Opal Tower, meaning some residents could be locked out of their apartments for months. On New Year’s Day, the engineering firm WSP said additional damage had been discovered on level four of the brand new building, a week after a large crack developed on level 10 on Christmas Eve. Residents had been promised last week they could return within 10 days, after they were evacuated a second time so engineers could assess the whole building. But the wait will now be longer for those on level four. Guy Templeton, the president of WSP in Australia & New Zealand, said the damage on level four was in the same kind of structure as the main crack on level 10, but was less severe.