There were guys who ran more than 11.5 secs
http://en.wikipedia.org/wiki/2009_World_Championships_in_Athletics_–_Men's_100_metres#Heats
Some small national federations get wild-cards to send an athlete even though no-one in their country has achieved a qualifier. Most of these countries will use their wild card to send a sprinter, as anyone can finish a 100m race.