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You have to wait in a line to get the 'darshan parchi' (visitor-slip) which you need to collect to get in, it's free. We waited around 3 hrs in line till 5pm but it turned out that they won’t give slips anymore till 5am next day as there are too many visitors for the day. It was quite disappointing but we thought of checking for the passes at the Defense Camp which is 1 Km ahead near Brhamakumari where you get special passes for defense people (my dad is Ex-Defnse Personnel)