1. Army jeep driving by watch tower, located near barrier tunnel
2. Soldier guarding barrier tunnel entrance
3. Watch tower as seen through barbed wire
4. Officer standing outside entrance to tunnel
6. Officer entering tunnel
7. Tracking shot inside tunnel
8. SOUNDBITE (English) Lieutenant Colonel Jonathan Conricus, Israeli military spokesman:
"The tunnel that we see here is one of three tunnels that have been destroyed over the last two months by the IDF. Thanks to new capabilities that we have, which are a combination of technological, intelligence and operational capabilities that are new, and a game changer."
9. Various of inside tunnel
10. SOUNDBITE (English) Lieutenant Colonel Jonathan Conricus, Israeli military spokesman:
"The obstacle being built is another layer of the security - that is the hard part of the security - which will be basically a concrete wall. A deep, underground concrete wall, which will be a hard barrier, and very difficult to tunnel through - not impossible but very difficult to tunnel through - and that will also provide us the basis for our defences, in addition to other components of that same defence system. Some of them we can speak about, some of them we cannot speak about."
11. Tracking shot inside tunnel
12. SOUNDBITE (English) Lieutenant Colonel Jonathan Conricus, Israeli military spokesman:
"Threats will continue to exist. Hamas still holds a significant arsenal of rockets that are aimed at Israeli cities and civilians, and Hamas has been overt about their intentions to kill Israeli civilians with whatever means they have capable. So the threat has not passed and the terror from Hamas has not passed, and we will continue to mitigate these other military capabilities that Hamas has. Concerning tunnels, today the situation is greatly improved."
Massive earthworks and mounds of sandy soil line much of the Israel-Gaza border as the Israeli military forges ahead with an ambitious subterranean barrier to detect and prevent attack tunnels from running into southern Israel from the Palestinian enclave.
The 40-mile (64 kilometre) long wall - construction of which got underway last summer - aims to thwart one of the major strategic assets Palestinian militant groups have to attack Israel.
The barrier - a subterranean wall plunging hundreds of feet (metres) below ground, studded with sensors and topped by a 26-foot (eight metres) metal fence - has an estimated price tag of 700 million US dollars and is on track for its slated completion in mid-2019.
Thus far, crews working 24 hours a day, six days a week have completed 2.5 miles (four kilometres) of the border barrier.
During a tour of the barrier on Thursday, Israeli military officials were loath to discuss particulars concerning the barrier's tunnel detection capabilities, or how deep the wall goes.
But a spokesman said that the anti-tunnel barrier under construction would provide a significant challenge for anyone tunnelling below.
Thus far, Hamas has not tried to disrupt construction, and giant earth berms protect workers from spying eyes and small arms fire.
Israel and Hamas, the Islamist militant group that has ruled the Gaza Strip since 2007, have fought three wars since 2008.
During most recent conflict in 2014, Hamas militants on several occasions caught Israel off guard by attacking through its underground tunnel network.
While Hamas fighters didn't manage to reach civilian centres, five Israeli soldiers were killed in such attacks, which rattled the Israeli public.
Israel destroyed 32 tunnels during that conflict, and has prioritised anti-tunnel operations since.
A combination of intelligence, infantry operations and hi-tech sensors have already helped the military detect and destroy at least three tunnels running from the Gaza Strip into Israeli territory in the past few months.