Hamas in weakest position yet, but still holds strategic leverage with tunnels 
Hamas's political leadership has suffered blows, but its underground tunnel network remains a significant threat. 
 Hamas terrorists against backdrop of Gaza tunnels. (illustration)(photo credit: ABED RAHIM KHATIB/FLASH90, REUTERS/JACK GUEZ)Updated:
 Hamas terrorists against backdrop of Gaza tunnels. (illustration)(photo credit: ABED RAHIM KHATIB/FLASH90, REUTERS/JACK GUEZ)Updated: