The Archaeological Survey of India (ASI) has started clearing the  
dense jungles where unexplored portions of the Siri Fort wall have  
remained hidden for centuries. While many parts of this 13th century  
wall located around Khel Gaon Marg, in the heart of south Delhi, have  
been exposed by ASI in earlier projects, it is planning to excavate  
the entire length of the wall. This exercise is expected to take up to  
a year. Sources say this is the only ancient wall in the city where  
it's possible to expose the entire structure, unlike Qila Rai Pithora  
or Jahapanah wall.

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http://timesofindia.indiatimes.com/Delhi/ASI_excavates_unseen_Siri_Fort_wall/articleshow/3805130.cms