Excerpt from Mr. Adnan Oktar's Live Conversation on A9 TV dated September 23rd 2012
ADNAN OKTAR: "Imam Mahdi will have the characteristics of Noah," says our Prophet (saas). "And by that he will be long-lived," he says. This is one aspect and the other aspect is that he is patient, just like the Prophet Noah (pbuh). The Qur'an says that he [The Prophet Noah(pbuh)] preaches religion in secret and in public and Hazrat Mahdi (pbuh) will preach religion in secret and in public as well.