Clad in black and armed with assault rifles Hamas fighters showed a dimly lit passageway underneath Gaza to a Reuters reporter, photographer and cameraman.
The rare tour was granted in an attempt to dispute Israel's claim that it had demolished all of the group's border infiltration tunnels.
A masked fighter from Hamas's Izz el-Deen al-Qassam Brigades said: "We are speaking to you today from inside one of those tunnels, which Israel said it had destroyed. Our men are still operating in those tunnels prepared for all options."
There have been two days of quiet in Gaza. No rockets or missiles, no more destroyed houses, no more ambulance sirens screaming.
A three-year-old girl has been rescued from Gaza and brought to London for life-saving heart surgery.
A small team of NHS doctors and surgeons is travel to Gaza to set up facilities and establish how best to use specialists and equipment.