hi everyone. thanks so much for joining me. i m jessica dean in for fredicka whitfield. the focus of israel s war in gaza has become al shifa hospital, israel long says that hamas uses that hospital to cover up what it says is an extensive terror network underground. israel believes it s building its case with the exposure of what it says is a tunnel shaft on the hospital s grounds. cnn s oren liebermann entered gaza with the israeli defense forces saturday night to see the tunnel shaft and what lies beneath. cnn reported from gaza under idf supervision. submitting footage to the israeli military for its review. reporter: we go in under cover of darkness. it s lights out. we switch into an armored personnel carrier for the final stretch. through a night vision screen you can see the magnitude of the destruction on the seats of gaza city. we offload at al shifa hospital. we have to keep our lights off most of the time or risk exposing our position. cnn reported from gaza und