The underground routes run for about 10 km and pass under a hospital and a university.
Top IDF officials have told The Jerusalem Post that it will take years to eliminate the Hamas tunnel threat.
The country in question said it had heard the report from senior Hamas officials.
This might be the worst-case scenario for Israel, but it would be very risky for Sinwar because of the high probability of being caught by the Egyptians.
The family was told that the video was found in a tunnel or in a hiding place.
Humani'Terre, an alias of a terror-designated organization known as CBSP, was designated by Israel and the US over two decades ago.
Saftawi says it's the first time in a decade that he's been able to speak on this publicly.
The IDF sharing a video of Yahya Sinwar in the Gaza tunnels wasn't meant for the Israeli public, but it was psychological warfare meant for Gazans, Sinwar, and even Ismail Haniyeh.
The two rescued hostages said that they received medication while in captivity, but a medical team estimates they did not receive the specific medicine they needed.
Israel says that UNRWA has not gone far enough to root out Hamas within the organization and was unwilling to clean up the issue systematically.
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